APA (7th ed.) Citation

Letter to Bouhéreau, La Rochelle, [unsigned], [no date].

Chicago Style (17th ed.) Citation

Letter to Bouhéreau, La Rochelle, [unsigned], [no Date].

MLA (9th ed.) Citation

Letter to Bouhéreau, La Rochelle, [unsigned], [no Date].

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