APA (7th ed.) Citation

Galsworthy, J., Wilson, A. B., & Lion, L. (1968). John Galsworthy's letters to Leon Lion. Mouton.

Chicago Style (17th ed.) Citation

Galsworthy, John, Asher Boldon Wilson, and Leon Lion. John Galsworthy's Letters to Leon Lion. The Hague: Mouton, 1968.

MLA (8th ed.) Citation

Galsworthy, John, et al. John Galsworthy's Letters to Leon Lion. Mouton, 1968.