Spiegel, Leonard
Regents, 1993
Buku Teks SO
Lothers, John E.
Prentice-Hall, 1965
Buku Teks SO
McCormac, Jack C.
Harper and Row , 1981
Buku Teks SO
McCormac, Jack C.
Pearson Education, 2018
Buku Teks SO
editor, Roger L. Brockenbrough, Frederick S. Maerritt
McGraw-Hill, 1994
Buku Referensi