Gaya APA

Costinett, S., Byrd, D, R, H. (1994). Spectrum 6, a communicative course in English (Jil.6). White Plaints, NY.: Prentice-Hall.

Gaya MLA

Costinett, Sandra., Byrd, Donald, R., H.. "Spectrum 6, a communicative course in English". Jil.6 White Plaints, NY.: Prentice-Hall, 1994. Text.