Gaya APA

Astin, A, W. (1977). Four Critical Years: Effects of College on Beliefs, Attitudes, and Knowledge . San Fransisco: Jossey-Bass Publishers.

Gaya MLA

Astin, Alexander, W.. "Four Critical Years: Effects of College on Beliefs, Attitudes, and Knowledge". San Fransisco: Jossey-Bass Publishers, 1977. Art Original.