Lampert, Hope
Atheneum, 1986
Buku Teks SO
Mueller, F. W.
McGraw-Hill Book Company, Inc., 1951
Buku Teks
Ranlett, John G.
John Wiley & Sons, 1969
Buku Teks SO
Ranlett, John G.
John Wiley & Sons, 1969
Buku Teks SO
Bradford, Frederick A.
Longmans, Green, 1939
Buku Teks