APA aipamena

Barnes, D., & Keenan, M. (1993). Concurrent activities and instructed human fixed-interval performance.

Chicago Style aipamena

Barnes, D., and M. Keenan. Concurrent Activities and Instructed Human Fixed-interval Performance. 1993.

MLA aipamena

Barnes, D., and M. Keenan. Concurrent Activities and Instructed Human Fixed-interval Performance. 1993.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.