Edward L. Kimball. “The History of LDS Temple Admission Standards.” Journal of Mormon History Spring (1998): 135-175. .

• Available electronically from the University of Utah library.
• This paper details the history of requirements, standards, and questions to receive a temple recommend (if they had them at the time) and enter an LDS temple. The implementation and standards embodied by the temple recommend questions have changed over time, but not extensively. An excellent and important article.