Gaya APA

Charles, G, G, K, P, A, S, D, W, D. (1979). Question In Combined Science 2 Teacher's Guide . London: John Murray Ltd.

Gaya MLA

Charles, Geoff, Green, Ken, Petford, Alan, Short, David, Walker, David. "Question In Combined Science 2 Teacher's Guide". London: John Murray Ltd, 1979. .