Paquette, Gerard A.
Holbrook Press, 1975
Buku Teks
Marano, Joseph
Prentice-Hall, 1973
Buku Teks
Sharp, Henry
Prentice-Hall, 1968
Buku Teks
Brixey, John C.
Holt, Rinehart and winston, 1954
Buku Teks
Brixey, John C.
Holt, Rinehart and winston, 1954
Buku Teks