Παραπομπή APA

Gray, O. S. (1973). Cases and materials on environmental law (2nd ed.). The Bureau of National Affairs.

Παραπομπή Chicago Style

Gray, Oscar S. Cases and Materials on Environmental Law. 2nd ed. Washington: The Bureau of National Affairs, 1973.

Παραπομπή MLA

Gray, Oscar S. Cases and Materials on Environmental Law. 2nd ed. The Bureau of National Affairs, 1973.