Παραπομπή APA

Higgins, A. (1976). Boilers room questions and answers. Mc Graw - Hill.

Παραπομπή Chicago Style

Higgins, Alex. Boilers Room Questions and Answers. New York: Mc Graw - Hill, 1976.

Παραπομπή MLA

Higgins, Alex. Boilers Room Questions and Answers. Mc Graw - Hill, 1976.