APA (7th ed.) Citation

Ball, J. T. (1969). The Pentagonal Principle for Self-Oriented Classes.

Chicago Style (17th ed.) Citation

Ball, Jerald T. The Pentagonal Principle for Self-Oriented Classes. 1969.

MLA (9th ed.) Citation

Ball, Jerald T. The Pentagonal Principle for Self-Oriented Classes. 1969.

Warning: These citations may not always be 100% accurate.