Wood, Harley
Angus and Robertson, 1967
Buku Teks
Morrison, David, author
Saunders College, 1990
Buku Teks
Hartman, William K., author
Wadsworth, 1985
Buku Teks
Seeds, Michael A.
Wadsworth, 1981
Buku Teks
Wyatt, Stanley P.
Allyn and Bacon, 1971
Buku Teks