Παραπομπή σε μορφή APA (7η εκδ.)

Souza, M. E. d. (1995). The six fundamental forces of nature. Department of Physics Universidade Federal de Sergipe.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Souza, Mario Everaldo de. The Six Fundamental Forces of Nature. Aracaju ; : Sergipe, Brazil: Department of Physics Universidade Federal de Sergipe, 1995.

Παραπομπή σε μορφή MLA (9th εκδ.)

Souza, Mario Everaldo de. The Six Fundamental Forces of Nature. Department of Physics Universidade Federal de Sergipe, 1995.