Παραπομπή σε μορφή APA (7η εκδ.)

Urbiztondo, L. G. (1979). Class vs. field activities as supplement to the lecture-discussion method: Effects on achievement in high school biology.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Urbiztondo, Lorna Galvan. Class Vs. Field Activities as Supplement to the Lecture-discussion Method: Effects on Achievement in High School Biology. 1979.

Παραπομπή σε μορφή MLA (9th εκδ.)

Urbiztondo, Lorna Galvan. Class Vs. Field Activities as Supplement to the Lecture-discussion Method: Effects on Achievement in High School Biology. 1979.