APA (7th ed.) Citation

Douglas, P. H. (1933). Collapse or cycle? American library association.

Chicago Style (17th ed.) Citation

Douglas, Paul Howard. Collapse or Cycle? Chicago: American library association, 1933.

MLA (8th ed.) Citation

Douglas, Paul Howard. Collapse or Cycle? American library association, 1933.

Warning: These citations may not always be 100% accurate.