Παραπομπή σε μορφή APA (7η εκδ.)

Howell, G. R. (1896). Letter, To: "Mr. Thomas C. Middleton O.S.A." From: George R. Howell, August 13, 1896.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Howell, George Rogers. Letter, To: "Mr. Thomas C. Middleton O.S.A." From: George R. Howell, August 13, 1896. 1896.

Παραπομπή σε μορφή MLA (8th εκδ.)

Howell, George Rogers. Letter, To: "Mr. Thomas C. Middleton O.S.A." From: George R. Howell, August 13, 1896. 1896.