APA (7th ed.) Citation

Hoyt, J. P. (1967). A brief introduction to probability theory. International Textbook.

Chicago Style (17th ed.) Citation

Hoyt, John P. A Brief Introduction to Probability Theory. Scranton, Pa: International Textbook, 1967.

MLA (9th ed.) Citation

Hoyt, John P. A Brief Introduction to Probability Theory. International Textbook, 1967.