APA (7th ed.) Citation

Hubbard, C. L., & Hawkins, C. A. (1969). Theory of valuation. Internat. Textbook.

Chicago Style (17th ed.) Citation

Hubbard, Charles L., and Clark A. Hawkins. Theory of Valuation. Scranton, Pa: Internat. Textbook, 1969.

MLA (9th ed.) Citation

Hubbard, Charles L., and Clark A. Hawkins. Theory of Valuation. Internat. Textbook, 1969.

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