APA aipamena

Kendrick, J. W. (1980). Productivity in the United States: Trends and cycles. London: The Johns opkins University Press.

Chicago Style aipamena

Kendrick, John W. Productivity in the United States: Trends and Cycles. London: The Johns opkins University Press, 1980.

MLA aipamena

Kendrick, John W. Productivity in the United States: Trends and Cycles. London: The Johns opkins University Press, 1980.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.