APA (7th ed.) Citation

Twentieth Century Fund, Shoup, C. S., Blough, R., & Newcomer, M. (1937). Studies in current tax problems. The Twentieth century fund.

Chicago Style (17th ed.) Citation

Twentieth Century Fund, Carl S. Shoup, Roy Blough, and Mabel Newcomer. Studies in Current Tax Problems. New York: The Twentieth century fund, 1937.

MLA (9th ed.) Citation

Twentieth Century Fund, et al. Studies in Current Tax Problems. The Twentieth century fund, 1937.