APA (7th ed.) Citation

Christophersen, P. (1939). The articles: A study of their theory and use in English. [publisher not identified].

Chicago Style (17th ed.) Citation

Christophersen, Paul. The Articles: A Study of Their Theory and Use in English. E. Munksgaard; [etc., etc.]: [publisher not identified], 1939.

MLA (9th ed.) Citation

Christophersen, Paul. The Articles: A Study of Their Theory and Use in English. [publisher not identified], 1939.