Rudd, Anthony S.
Ellis Horwood, 1991
Buku Teks
Smith, R. V.
PennWell Publishing, 1990
Buku Teks SO
edited by Anne Grodzins Lipow and Deborah A. Carver
American Library Association, 1992
Buku Teks SO
Betty, John Galtress, 1922-
McGraw-Hill, 1993
Buku Teks SO
Hogan, Rex, 1944-
Prentice-Hall, 1990
Buku Teks SO