Saunders, Anthony, author
McGraw-Hill, 2001
Buku Teks
Johnson, Hazel J., author
McGraw-Hill, 1993
Buku Teks
Holler, Julian, author
[Gabler Verlag, ], 2012
eBooks
Saunders, Anthony, author
McGraw-Hill, 1997
Buku Teks
Belshaw, Cyril S., author
Prentice-Hall, 1965
Buku Teks