Spotts, M.F. (Merhyle Franklin), author
Prentice-Hall, 1971
Buku Teks
Faires, Virgil Moring
Macmillan, 1965
Buku Teks
Hall, Allen S., author
McGraw-Hill, 1961
Buku Teks
Black, Paul H.
McGraw-Hill, 1968
Buku Teks
Kolstee, Hans M.
Holt, Rinehart and Winston, 1985
Buku Teks