APA (7th ed.) Citation

Levine, M. V., & Saxe, D. H. (1976). The use of periodic functions to measure the difficulty of aptitude test items. [s.n.].

Chicago Style (17th ed.) Citation

Levine, Michael V., and David H. Saxe. The Use of Periodic Functions to Measure the Difficulty of Aptitude Test Items. Princeton, N.J: [s.n.], 1976.

MLA (9th ed.) Citation

Levine, Michael V., and David H. Saxe. The Use of Periodic Functions to Measure the Difficulty of Aptitude Test Items. [s.n.], 1976.