Wood, Jesse H.
Evenston Harper, 1963
Buku Teks SO
Andrews, Donald H.
Wiley Eastern, 1965
Buku Teks SO
King, G. Brooks
American Book Company, 1963
Buku Teks SO
Sorum, C.H.
Prentice-Hall, 1955
Buku Teks SO
Murphy, Daniel B.
Ronald Press, 1980
Buku Teks SO