by Royston M. Roberts ... [et al.]
Rinehart and Winston, 1969
Buku Teks
Dannley, Ralph L.
Macmillan, 1968
Buku Teks
Doyle, Michael P.
John Wiley & Sons, 1980
Buku Teks
Griffin, Rodger W.
McGraw-Hill, 1969
Buku Teks
Kice, John L.
Macmillan, 1972
Buku Teks