APA (7th ed.) Citation

Wardwell, C. A. R. (1927). An investigation of economic data for major cycles. [publisher not identified].

Chicago Style (17th ed.) Citation

Wardwell, Charles Annsson Randlett. An Investigation of Economic Data for Major Cycles. Philadelphia: [publisher not identified], 1927.

MLA (9th ed.) Citation

Wardwell, Charles Annsson Randlett. An Investigation of Economic Data for Major Cycles. [publisher not identified], 1927.