APA (7th ed.) Citation

Powys, J. C., & Hanley, J. Autograph letter signed: Dear Mr Hanley.

Chicago Style (17th ed.) Citation

Powys, John Cowper, and James Hanley. Autograph Letter Signed: Dear Mr Hanley.

MLA (9th ed.) Citation

Powys, John Cowper, and James Hanley. Autograph Letter Signed: Dear Mr Hanley.

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