Alarid, Leanne Fiftal, author
Wadsworth and Cengage Learning, 2013
Buku Teks
Bayens, Gerald, author
McGraw-Hill, 2013
Buku Teks
Suarr, Richard W.
Brown and Benchmark, 1996
Buku Teks
Allen, Harry E.
Macmillan Publishing Company, 1989
Buku Teks
Suarr, Richard W.
Brown and Benchmark, 1996
Buku Teks