Vogt, W. P. (2012). When to use what research design. New York: Guilford Press.
Trích dẫn kiểu ChicagoVogt, W. Paul. When to Use What Research Design. New York: Guilford Press, 2012.
Deismireacht MLAVogt, W. Paul. When to Use What Research Design. New York: Guilford Press, 2012.
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