edited by Robert H. Beck
National Association of Social Workers, 1965
Buku Teks
Taylor, Neil
Sense, 2012
eBooks
Hannele Niemi
Sense, 2012
eBooks
Pfeiffer, John, author
City The Odyssey Press , 1968
Buku Teks
Spanbauer, Stanley J.
ASQC Quality Press, 1993
Buku Teks