APA (7th ed.) Zitazioa

Hobbs, G. M. (1972). Practical mathematics (3rd.ed.). American technical.

Chicago Style (17th ed.) Zitazioa

Hobbs, Glen M. Practical Mathematics. 3rd.ed. Illinois: American technical, 1972.

MLA (9th ed.) Zitazioa

Hobbs, Glen M. Practical Mathematics. 3rd.ed. American technical, 1972.