I've just started reading "Year of Doom, 1975: The Inside Story of Jehovah's Witnesses" by English author J.C. Stevenson. It was published in 1967 as basically a memoir of his years in the Dubs, including time as a pioneer, and an explanation of the methods used by them to make the organisation grow.
It's not the best "insider" book I've written, but there is a section I've uploaded below that makes some interesting points about the home bible study procedure and why it is so effective at turning interested people into baptism candidates. Reading through this, I see myself back in the mid-80s sitting there getting led, week by week, into the trap.
This section is from chapter 2, "The Seed is Watered" in which he explains the typical process following a few return visits.