edited by Muriel Albers Bittel, Lester Robert Bittel and Jackson Eugene Ramsey
Grolier International, 1995
Buku Referensi
Shapiro, Benson P.
Richard D. Irwin, 1985
Buku Teks
Allen, Louis A.
McGraw-Hill , 1973
Buku Teks
Robbins, Stephen P.
Prentice-Hall, 1997
Buku Teks
Hitt, Michael A.
Pearson, 2009
Buku Teks