Cita APA (7th ed.)

Armstrong, D. 1. J. 3., Calnan, M., & Grace, J. (1990). Research methods for general practitioners. Oxford University Press.

Cita Chicago (17th ed.)

Armstrong, David 1947 June 3-, Michael Calnan, i John Grace. Research Methods for General Practitioners. Oxford: Oxford University Press, 1990.

Cita MLA (9th ed.)

Armstrong, David 1947 June 3-, et al. Research Methods for General Practitioners. Oxford University Press, 1990.