by John S. Wright ... [et.al.]
McGraw-Hill, 1977
Buku Teks
Bovee, Courtland L., author
Richard D. Irwin, 1989
Buku Teks
Dyer, Gillian
Routledge, 1996
Buku Teks
Lwin, May, author
Bhuana Ilmu Populer, 2005
Buku Teks
Shelly Rodgers and Esther Thorson
Routledge, 2012
Buku Teks