Daniel, Carter A., author
McGraw-Hill, 2012
Buku Teks
Gartside, L. (Leonard), author
Macdonald and Evans, 1982
Buku Teks
Holt, Rinehart and Winston of Canada, Limited, 1988
Buku Teks
Shurter, Robert L.
McGraw-Hill, 1957
Buku Teks
Himstreet, William C.
Kent Publishing Company, 1984
Buku Teks