Chapter 9 from Chariots For Apollo by Brooks, Courtney G., Grimwood, James M., and Swenson, Loyd S., Jr. Chariots for Apollo: A History of Manned Lunar Spacecraft. (Washington, DC: NASA SP-4205, 1979).
Chapter 18 from Moonport by
Benson, Charles D. and Faherty, William Barnaby. Moonport: A History of Apollo Launch Facilities and Operations. (Washington, DC: NASA SP-4204, 1978).