Quigley, Harold S., author
World Peace Foundation, 1938
Buku Teks
edited by Larry Earl Bone
Champaign, Illinois University of Illinois Graduate School of Library Science 1968, 1968
Buku Teks
MacNair, Harley Farnsworth
D.van Nostrand Company,Inc., 1955
Buku Teks
MacNair, Harley Farnsworth
D.van Nostrand Company,Inc., 1950
Buku Teks
Buss, Claude Albert, author
Mamillan, 1955
Buku Teks