APA

Phelps H. A., . (1952). Contemporary social problems. n.p: s.n.

Chicago

Phelps Harold Augustus, . 1952. Contemporary social problems. n.p: s.n.

Harvard

Phelps H. A., . (1952). Contemporary social problems. n.p: s.n.

MLA

Phelps Harold Augustus, . Contemporary social problems. n.p: s.n. 1952.