Παραπομπή APA

Open Universityearth's Physical Resources Course Team & Open University, E. P. (1974). Implications. Open university press.

Παραπομπή Chicago Style

Open Universityearth's Physical Resources Course Team και Earth's Physic Open University. Implications. Open university press, 1974.

Παραπομπή MLA

Open Universityearth's Physical Resources Course Team και Earth's Physic Open University. Implications. Open university press, 1974.