Fishel, Derry L., author
Macmillan, 1971
Buku Teks
by Royston M. Roberts ... [et al.]
Rinehart and Winston, 1969
Buku Teks
Doyle, Michael P., author
John Wiley & Sons, 1980
Buku Teks
Dannley, Ralph L., author
Macmillan, 1968
Buku Teks
Griffin, Rodger W., author
McGraw-Hill, 1969
Buku Teks