APA (7th ed.) Citation

Gruber, H. E., & Weitman, M. (1962). Self-directed study: Experiments in higher education.

Chicago Style (17th ed.) Citation

Gruber, Howard E., and Morris Weitman. Self-directed Study: Experiments in Higher Education. [Boulder? Colo.], 1962.

MLA (8th ed.) Citation

Gruber, Howard E., and Morris Weitman. Self-directed Study: Experiments in Higher Education. 1962.