Sjamsul Bahri
Pustaka Indonesi, [date of publication not identified]
Koleksi Publik
Ng, Aik Kwang, author
Prentice-Hall, 2001
Buku Teks
Brown, Judith M, author
Cambridge University Press, 2006
Buku Teks
Welt, Paul Thomas
J.B. Lippincott Company, 1976
Buku Teks
Ng, Aik Kwang, author
Prentice-Hall, l2001
Buku Teks