APA (7th ed.) Zitazioa

Hewitt, G. (1978). How to sing. EMI Music.

Chicago Style (17th ed.) Zitazioa

Hewitt, Graham. How to Sing. London: EMI Music, 1978.

MLA (9th ed.) Zitazioa

Hewitt, Graham. How to Sing. EMI Music, 1978.