Παραπομπή σε μορφή APA (7η εκδ.)

Gilbert, H., & Smith, D. G. (1997). Gravity, the glue of the universe: History and activities. Teacher Ideas Press.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Gilbert, Harry, και Diana Gilbert Smith. Gravity, the Glue of the Universe: History and Activities. Englewood, Colo.: Teacher Ideas Press, 1997.

Παραπομπή σε μορφή MLA (8th εκδ.)

Gilbert, Harry, και Diana Gilbert Smith. Gravity, the Glue of the Universe: History and Activities. Teacher Ideas Press, 1997.