APA

Schumpeter J. A., Opie R., . (1961). The theory of economic development: an inquiry into profits, capital, credit, interest, and the business cycles. New York: Oxford University Press.

Chicago

Schumpeter Joseph A, Opie Redvers, . 1961. The theory of economic development: an inquiry into profits, capital, credit, interest, and the business cycles. New York: Oxford University Press.

Harvard

Schumpeter J. A., Opie R., . (1961). The theory of economic development: an inquiry into profits, capital, credit, interest, and the business cycles. New York: Oxford University Press.

MLA

Schumpeter Joseph A, Opie Redvers, . The theory of economic development: an inquiry into profits, capital, credit, interest, and the business cycles. New York: Oxford University Press. 1961.