John, Robert St
Time Incorporated, 1962
Buku Teks SO
Page, Bruce
Doubleday & Company, Inc., Garden City,, 1968
Buku Teks SO
Pomeroy, John H.
Holt, Rinehart and Winston, 1964
Buku Teks SO
Peter Peregrinus Ltd. on behalf of the Institution of Electrical Engineers, 1992
Buku Teks SO
Barton, John H.
Stanford University Press, 1981
Buku Teks SO