Every BBST® course contains a series of required and recommended readings that help develop a deeper understanding of Black Box Software Testing and other software testing general concepts or help build valuable skills.
The AETG System: An Approach to Testing Based on Combinatorial Design, by D. M. Cohen, S. R. Dalal, M. L. Fredman, and G. C. Patton, is a recommended reading from the BBST® Test Design course.