APA استشهاد

Friedmann, W. (1971). The Future of the Oceans. Vakils, Feffer and Simons.

استشهاد بنمط شيكاغو

Friedmann, Wolfganc. The Future of the Oceans. Bombay: Vakils, Feffer and Simons, 1971.

MLA استشهاد

Friedmann, Wolfganc. The Future of the Oceans. Vakils, Feffer and Simons, 1971.