APA način citiranja (7. izdanje)

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

Čikaški stil citiranja (17. izdanje)

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

MLA način citiranja (8. izdanje)

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