APA (7th ed.) Citation

Grant, F. D. Autograph letter signed: N.p., to unknown person, n.p.

Chicago Style (17th ed.) Citation

Grant, F. D. Autograph Letter Signed: N.p., to Unknown Person, N.p.

MLA (8th ed.) Citation

Grant, F. D. Autograph Letter Signed: N.p., to Unknown Person, N.p.

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