Armstrong, D. 1. J. 3., Calnan, M., & Grace, J. (1990). Research methods for general practitioners. Oxford University Press.
Chicago Style (17. basım) AtıfArmstrong, David 1947 June 3-, Michael Calnan, ve John Grace. Research Methods for General Practitioners. Oxford: Oxford University Press, 1990.
MLA (9th ed.) AtıfArmstrong, David 1947 June 3-, et al. Research Methods for General Practitioners. Oxford University Press, 1990.
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