Urbiztondo, L. G. (1979). Class vs. field activities as supplement to the lecture-discussion method: Effects on achievement in high school biology.
Lua i Stíl Chicago (17ú heag.)Urbiztondo, Lorna Galvan. Class Vs. Field Activities as Supplement to the Lecture-discussion Method: Effects on Achievement in High School Biology. 1979.
Lua MLA (9ú heag.)Urbiztondo, Lorna Galvan. Class Vs. Field Activities as Supplement to the Lecture-discussion Method: Effects on Achievement in High School Biology. 1979.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.