Gaya APA

Yeadon, R, O, R, K, B, &, T. (1971). Kernel Lessons Intermediate Students' Book (Ketiga). London: Longman Group Limited.

Gaya MLA

Yeadon, Robert, O\'Neill,, Roy, Kings, Bury, &, Tony. "Kernel Lessons Intermediate Students' Book". Ketiga London: Longman Group Limited, 1971. Text.