Mund, Vernon A.
Appleton-Century-Crofts, 1971
Buku Teks SO
Lundy, James L.
Eurasia Publishing House, 1968
Buku Teks
Bethel, Lawrence L.
McGraw-Hill Kogakusha, 1971
Buku Teks
Spriegel, William Robert, 1893-1972
Charles & Tuttle, 1958
Buku Teks
Brown, Wilfred
Heinemann, 1971
Buku Teks