de Vries, Louis, author
McGraw-Hill, 1959
Buku Referensi
Dorian, A.F., author
Elsevier Scientific Publishing Company, 1981
Buku Referensi
Messinger, Heinz, author
Langenscheidt, 1993
Buku Referensi
Goulden, W. O., author
Little, Brown, 1955
Buku Referensi
Engel, Thomas, author
Pearson Prentice Hall, 2008
Buku Teks