Christianson, Deann
Brooks/Cole, , 1998
Buku Teks
Palmer, Claude Irwin, author
McGraw-Hill, 1994
Buku Teks
Johson, David B., author
Grove Brooks/Cole, 1999
Buku Teks
Richman, Fred, 1938-, author
Brooks/Cole, 1967
Buku Teks
Nielsen, Kaj L.
Barnes & Noble, 1962
Buku Teks