APA (7th ed.) Citation

Sobel, P. (1963). United States History / Robert Sobel, Ph.D. Collier Books.

Chicago Style (17th ed.) Citation

Sobel, Ph.d. United States History / Robert Sobel, Ph.D. Collier Books, 1963.

MLA (8th ed.) Citation

Sobel, Ph.d. United States History / Robert Sobel, Ph.D. Collier Books, 1963.

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