Sommer, Robert
Behavioral research: Tools and techniques
New York, 2002
 Buku Teks
Peterson, Sandra J.
Middle range theories: application to nursing research
Lippincott , 2004
 Buku Teks
Makower, M.S.
Operational research : problems, techniques and exercises
Butles and Tanner , 1970
 Buku Teks
Lindzey, Gardner
Projective techniques and cross-cultural research
Appleton Century Crofts, 1961
 Buku Teks
Maafs, Kurt-Jurgen
Bridges for research: range and impact of the Humboldt foundation / Kurt-Jurgen Maafs
Alexander Von Humboldt Foundation , 1989
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