Perry, James W.
Wadsworth, 1996
Buku Referensi
Strete, Dennis
McGraw-Hill, 2012
Buku Teks
edited by Jeanne C. Scherer
J.B. Lippincott , 1985
Buku Referensi
edited by Sandra M. Nettina
J.B. Lippincott, 1996
Buku Teks
Brunner, Lilian Sholtis
J.B Lippincott , 1982
Buku Teks