Hardy, F. Lane
West Publishing, 1984
Buku Teks SO
Nielsen, Kaj L.
Cliff's Notes, [Date of publication not identified]
Buku Teks SO
Kovacic, Michael L.
Prindle, Weber and Schmidt , 1971
Buku Teks SO
Paquette, Gerard A.
Holbrook Press, 1975
Buku Teks SO
Marano, Joseph
Prentice-Hall, 1973
Buku Teks SO