Actually there are plenty of references. Search "Islam" in the WT CD and you get these:
ISLAM
(See also Koran; Muhammad)
Allah: sh 284-5
attitude toward Trinity: sh 296-7; ti 4
beliefs: sh 295-7, 299-303; rs 23-4
Abraham: w86 4/15 6
Adam: gu 8
Bible: gu 4, 30-1; sh 286
condition of the dead: sh 297, 299-300
death: g88 7/8 8
fasting: w96 11/15 4
fate (Kismet): w90 8/15 3, 6
Five Pillars of Islam: sh 303; g89 7/22 22
holy war: g89 7/22 22
influence of ancient Greece: ie 16
Jesus Christ: ol 9; gu 20-1; ct 145; sh 295-6
judgment day: w01 7/15 3
Mahdi (rightly guided one): w92 10/1 6
monotheism (no Trinity): sh 296-7
name of God: gu 10; w93 11/1 3-4
Paradise: sh 300
resurrection: sh 297
Six Pillars of Belief: sh 296
soul: w99 4/1 13-14; ie 16; w90 5/1 18; sh 297, 299-300; g88 7/8 8
sources: g89 7/22 22
Sufism (mysticism): g89 7/22 24
dating system (calendar): sh 292; it-1 447
discussion: g91 1/8 17-18; sh 284-303; g89 7/22 21-4
empire: g89 7/22 22-3
map: g89 7/22 23
experiences:
appreciation for Awake! series: g94 12/8 30
Black Muslims: w01 9/15 4, 6; g90 3/22 21-4
Muslims accept truth: yb99 74, 76; km 2/98 4; yb90 235; w88 6/1 21; w86 4/15 23
prays for truth: w98 4/15 27
professor intrigued by Bible questions: w92 12/15 28
visitor to Germany branch office: g03 3/8 24
former Soviet republics:
agreement with Russian Orthodox leaders to stop Witnesses and others: g96 5/22 28
Imam a chaplain in U.S. army: g94 6/8 28
Iran:
Khomeini’s objectives: g87 1/8 8; g87 4/22 4
Shiite objectives: g87 1/8 8
Kaaba: g94 3/8 24; g91 1/8 17-18; sh 287, 289, 292
marriage: sh 300-1
meaning of terms:
A.H.: sh 292
Allah: g89 7/22 21
Barzakh: ie 16; sh 299
hegira (hijrah): sh 292; g89 7/22 21
imam: sh 293
Islam: sh 285; g89 7/22 21
Koran: sh 284; g89 7/22 21
Muslim: sh 285; g89 7/22 21
muta: sh 300-1
shahadah: sh 296, 303
sura: sh 284
more than just a religion: g89 7/22 22
mosques: sh 301-2
Casablanca, Morocco: g89 5/8 29
Córdoba, Spain: sh 302-3; g88 11/8 25
Jerusalem, Israel: it-2 48
photos: sh 298
Rome, Italy: g90 1/22 29
number of Muslims: sh 284-5
percentage of world population: w89 7/1 3
prayer: sh 284, 301
propagation of beliefs: g88 11/8 24
sword used in response to Crusades: g89 8/8 22
sacred places:
Jerusalem: sh 286, 298; g89 7/22 22
Mecca: g94 3/8 23-4; sh 4, 286-7, 289, 303; g89 7/22 22
Medina: sh 292; g89 7/22 22
sacred writings:
Hadith (Sunna): sh 290-1
Koran: sh 17, 284-6, 288, 290-1
Shari‘a: sh 290-1
Saudi Arabia:
pilgrims die in stampede: g90 10/8 28-9
sects: g89 7/22 23-4
Khariji: sh 294; g89 7/22 22
Shiah: sh 293-5, 301; g89 7/22 23-4
Sunni: sh 293-5, 301; g89 7/22 23
Spain: sh 302; g89 8/8 22; g88 11/8 23-7
spread: g89 8/8 22-3
after death of Muhammad: sh 292
after sixth century C.E.: sh 302
successors to Muhammad: sh 293-5
‘transmission belt for technology’: g88 11/8 26-7
United States: g01 12/22 29
war:
former Yugoslavia: g94 10/22 4
witnessing to Muslims: km 11/99 8; km 2/98 6; w94 6/15 27; km 1/91 7; km 8/91 1; km 12/90 1; rs 23-4; w87 2/15 28
articles "Is Our Future Written in Advance?" and "What Will Your Future Be?": w98 4/15 3-8
Bible authenticity: gu 29-31
brochure The Guidance of God—Our Way to Paradise: gu 1-32; km 11/99 8; km 12/98 7
Jesus as God’s Son: ol 9; gu 20; ct 145
tract How to Find the Road to Paradise: km 11/90 7