Ferguson, C. E., author
Holt, Rinehart and Winston, 1965
Buku Teks
Miller, Roger LeRoy, author
Pearson education, 2010
Buku Teks
Case, Karl E., author
Pearson, 2017
Buku Teks
Fairchild, Fred Rogers, author
Macmillan, 1954
Buku Teks
Spencer, Milton H., author
Worth, 1971
Buku Teks