Nichols, Eugene D.
Rinehart Press, 1975
Buku Teks SO
Meserve, Bruce E.
Prentice-Hall, 1969
Buku Teks SO
Whitehead, Alfred North, 1861-1947
Oxford University Press, 1969
Buku Teks SO
Horner, Donald H.
Rinehart, 1973
Buku Teks SO
White, Paul A.
Dickenson, 1970
Buku Teks SO