APA

Grad F. P., . (1971). Environmental law: sources and problems. New York: M. Bender.

Chicago

Grad Frank P, . 1971. Environmental law: sources and problems. New York: M. Bender.

Harvard

Grad F. P., . (1971). Environmental law: sources and problems. New York: M. Bender.

MLA

Grad Frank P, . Environmental law: sources and problems. New York: M. Bender. 1971.