Macey, Robert I., author
Prentice-Hall, 1968
Buku Teks
Wright, Samson
Oxford University Press, 1928
Buku Referensi
Wright, Samson
Oxford University Press, 1931
Buku Referensi
Yefta Moenadjat, Amir Madjid, Parlindungan Siregar, editors
BP FKUI, 2012
Buku Teks
Santrock, John W.
McGaw-Hill, 2005
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