APA

Johnson H. G., . (19721971). Aspects of the theory of tariffs. Cambridge, Mass: Harvard University Press.

Chicago

Johnson Harry G, . 19721971. Aspects of the theory of tariffs. Cambridge, Mass: Harvard University Press.

Harvard

Johnson H. G., . (19721971). Aspects of the theory of tariffs. Cambridge, Mass: Harvard University Press.

MLA

Johnson Harry G, . Aspects of the theory of tariffs. Cambridge, Mass: Harvard University Press. 19721971.