Sherwood, Lauralee
Brooks/Cole Cengage Learning, 2012
Buku Teks
Bainbridge, F.A.
Longmans, Green , 1919
Buku Teks
Rhoades, Rodney A.
Little, Brown & Co., 1995
Buku Teks
McCorry, Laurie Kelly
CRC Press, Taylor & Francis Group, 2009
Buku Teks
Seeley, Rod R.
McGraw-Hill, 2002
Buku Teks