Nation, J. R. (1997). Research methods. Prentice Hall.
Chicago Style (17th ed.) CitationNation, Jack R. Research Methods. Upper Saddle River, N.J: Prentice Hall, 1997.
MLA (9th ed.) CitationNation, Jack R. Research Methods. Prentice Hall, 1997.
Advarsel: Disse citationer er muligvist ikke 100% nøjagtige.