Cooper, Melanie M., author
McGraw-Hill, 2009
Buku Teks
Washington, D.C. I.C.A. 1957,
Buku Teks
Michael N. Schmitt, general editor
Cambridge University Press, 2013
Buku Teks
The University of Winconsin Press, 1977
Buku Teks
Abrahamsen, Martin A., author
McGraw-Hill Book , 1976
Buku Teks