Gaya APA

BYRD, D, R, H. et al (1983). Spectrum Workbook 2 A Communicative Course in English . New Jersey: Prentice-Hall.

Gaya MLA

BYRD, DONALD, R., H.. et al. "Spectrum Workbook 2 A Communicative Course in English". New Jersey: Prentice-Hall, 1983. Text.