Cita APA (7a ed.)

Ehret, W. F., Schneider, W. A., Van Der Merwe, C. W., & Wahlert, H. E. (1948). Physical science. The Macmillan company.

Cita Chicago Style (17a ed.)

Ehret, William Frederick, Walter A. Schneider, Carel W. Van Der Merwe, y Howard E. Wahlert. Physical Science. New York: The Macmillan company, 1948.

Cita MLA (9a ed.)

Ehret, William Frederick, et al. Physical Science. The Macmillan company, 1948.