Geoffrey Keppel. (1982). Design and analysis: A researcher's handbook. Englewood Cliffs, New Jersey: Prentice-Hall.
Trích dẫn kiểu ChicagoGeoffrey Keppel. Design and Analysis: A Researcher's Handbook. Englewood Cliffs, New Jersey: Prentice-Hall, 1982.
Deismireacht MLAGeoffrey Keppel. Design and Analysis: A Researcher's Handbook. Englewood Cliffs, New Jersey: Prentice-Hall, 1982.
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