APA (7th ed.) Citation

Powys, P. Autograph letter signed: My dear Sylvia.

Chicago Style (17th ed.) Citation

Powys, Philippa. Autograph Letter Signed: My Dear Sylvia.

MLA (9th ed.) Citation

Powys, Philippa. Autograph Letter Signed: My Dear Sylvia.

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