APA (7th ed.) Citation

Thomas, H., Thomas, E., & Thomas, R. G. (1985). A handful of letters. Tragara Press.

Chicago Style (17th ed.) Citation

Thomas, Helen, Edward Thomas, and R. George Thomas. A Handful of Letters. Edinburgh: Tragara Press, 1985.

MLA (9th ed.) Citation

Thomas, Helen, et al. A Handful of Letters. Tragara Press, 1985.