See Allo

Hirsch, Eric Donald, Jr., author

Validity in interpretation

Yale University Press, 1976

Buku Teks

Biology : observation and concept

James F. Case and Vernon E. Stiers

Macmillan, 1971

Buku Teks

Allwright, Dick, author

Observation in the language classroom

Longman, 1993

Buku Teks

Rodriguez, Noelie, author

Systematic self-observation

Sage Publications, 2001

Buku Teks

Walker, Alexander M., author

Observation and inference : an introduction to the methods of epidemiology

Lower Falls Epidemiology Resainces, 1991

Buku Teks

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