Jacson, Maria Elizabetha, author
Cambridge University Press, 2014
Buku Teks
Strearn, William T.
David & Charles, 1983
Buku Referensi
Short, Ema, author
Cambridge University Press, 2013
Buku Teks
Berlyn, Graeme P., author
Iowa State University Press, 1976
Buku Teks
Plowden, C. Chicheley
George Allen and Unwin, 1972
Buku Teks