Παραπομπή σε μορφή APA (7η εκδ.)

Penn, W. (1854). A key opening the way to every capacity. for sale at Friends' Bookstore.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Penn, William. A Key Opening the Way to Every Capacity. Philadelphia: for sale at Friends' Bookstore, 1854.

Παραπομπή σε μορφή MLA (8th εκδ.)

Penn, William. A Key Opening the Way to Every Capacity. for sale at Friends' Bookstore, 1854.