Abell, George O., author
Holt Rinehart and Winston, 1974
Buku Teks
Koupelis, Theo, author
Jones & Bartlett learning, 2011
Buku Teks
Seeds, Michael A.
Wadsworth, 1981
Buku Teks
Goldsmith, Donald, author
Perseus Books, 2000
Buku Teks
Wood, Harley
Angus and Robertson, 1967
Buku Teks