APA (7th ed.) Citation

Gaussen, E. Letter from Gaussen to Bouhéreau, La Rochelle, [no date].

Chicago Style (17th ed.) Citation

Gaussen, Etienne. Letter from Gaussen to Bouhéreau, La Rochelle, [no Date].

MLA (9th ed.) Citation

Gaussen, Etienne. Letter from Gaussen to Bouhéreau, La Rochelle, [no Date].

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