Cayer, N. Joseph, author
Thomson wadsworth, 2004
Buku Teks
Cayer, N. Joseph., author
Wadsworth/Thomson Learning, 2004
Buku Teks
Klingner, Donald E.
Prentice-Hall, 1980
Buku Teks
Pigors, Paul, author
McGraw-Hill , 1961
Buku Teks
Pigors, Paul, author
McGraw-Hill, 1969
Buku Teks