Cita APA

Newberg, D. W. (1974). A study guide to Earth. US: W.H. Freeman and company, San Francisco.

Citación estilo Chicago

Newberg, Donald W. A Study Guide to Earth. US: W.H. Freeman and company, San Francisco, 1974.

Cita MLA

Newberg, Donald W. A Study Guide to Earth. US: W.H. Freeman and company, San Francisco, 1974.