APA استشهاد

Alt,James.E. (1990). Perspectives on positive political economy. Cambridge University Press.

استشهاد بنمط شيكاغو

Alt,James.E. Perspectives on Positive Political Economy. Cambridge: Cambridge University Press, 1990.

MLA استشهاد

Alt,James.E. Perspectives on Positive Political Economy. Cambridge University Press, 1990.