edited by O.B. Jesness
Blakiston , 1950
Buku Teks
Helmberger, Peter G., author
McGraw-Hill, 1991
Buku Teks
Malott, Deane W., author
McGraw-Hill, 1939
Buku Teks
Cramer, Gail L., author
John Wiley & Sons, 1979
Buku Teks
edited by E.L. Baum, Howard G. Diesslin and Earl O. Heady
Iowa State University Press, 1961
Buku Teks