APA (7th ed.) Citation

Brongniart, A., Jay, F. W., & Frank Webster Jay Collection. (1831). Autograph letter signed: Sèvres, France, to unknown person, n.p.

Chicago Style (17th ed.) Citation

Brongniart, Alexandre, Frank Webster Jay, and Frank Webster Jay Collection. Autograph Letter Signed: Sèvres, France, to Unknown Person, N.p. 1831.

MLA (8th ed.) Citation

Brongniart, Alexandre, et al. Autograph Letter Signed: Sèvres, France, to Unknown Person, N.p. 1831.

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