Gaya APA

Ytreberg, W, A, S, L, H. (). LONGMAN KEYS TO LANGUAGE TEACHING Teaching English to Children . london & New york: Longman.

Gaya MLA

Ytreberg, Wendy, A., Scott, Lisbeth, H.. "LONGMAN KEYS TO LANGUAGE TEACHING Teaching English to Children". london & New york: Longman, . Text.