Penn, W. (1854). A key opening the way to every capacity. for sale at Friends' Bookstore.
Lua i Stíl Chicago (17ú heag.)Penn, William. A Key Opening the Way to Every Capacity. Philadelphia: for sale at Friends' Bookstore, 1854.
Lua MLA (8ú heag.)Penn, William. A Key Opening the Way to Every Capacity. for sale at Friends' Bookstore, 1854.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.