Taylor, Grant
McGraw-Hill, 1967
Buku Teks
Shin, Edysen
Kesaint Blanc, 2013
Multimedia
Pardiyono
Yogyakarta : Andi Offset, 2005,
Buku Teks
Laski, Harold J.
George Allen and Unwin, 1948
Buku Teks SO
Laski, Harold J.
George Allen and Unwin, 1950
Buku Teks SO