APA (7th ed.) Citation

Hassal, M., A lady at Cape Francois, & Burr, A. (1971). Secret history. Books for Libraries Press.

Chicago Style (17th ed.) Citation

Hassal, Mary, A lady at Cape Francois, and Aaron Burr. Secret History. Freeport, N.Y.: Books for Libraries Press, 1971.

MLA (9th ed.) Citation

Hassal, Mary, et al. Secret History. Books for Libraries Press, 1971.