Dyfyniad APA

Williamson, T., & O'Hear, A. (2009). Knowledge of counterfactuals. Cambridge University Press.

Dyfyniad Arddull Chicago

Williamson, T., and A. O'Hear. Knowledge of Counterfactuals. Cambridge University Press, 2009.

Dyfyniad MLA

Williamson, T., and A. O'Hear. Knowledge of Counterfactuals. Cambridge University Press, 2009.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.