APA (7th ed.) Citation

Lange, O. (1945). Price flexibility and empoyment. Principia Press.

Chicago Style (17th ed.) Citation

Lange, Oskar. Price Flexibility and Empoyment. Bloomington [Indiana]: Principia Press, 1945.

MLA (9th ed.) Citation

Lange, Oskar. Price Flexibility and Empoyment. Principia Press, 1945.