Meyer, Robert G., author
Pearson, Allyn and Bacon, 2006
Buku Teks
Meyer, Robert G., author
Pearson, 2014
Buku Teks
Veatch, Robert M., author
Oxford University Press, 2008
Buku Teks
edited by Elizabeth Marting and Albert Newgardsen
International Management Association, 1957
Buku Teks
Terry, George Robert, author
Prentice-Hall, 1956
Buku Teks