Cortada, James W., author
McGraw-Hill, 1994
Buku Referensi
edited by Charles Moritz
The H.W. Wilson Company , 1963
Buku Referensi
Michael Orey
Springer, 2012
eBooks
Taylor and Francis , 2012
Buku Referensi
Library Association Publishing, 1992
Buku Referensi