Bishop, O. N. (1984). Exploring FORTH. Granada.
Lua i Stíl Chicago (17ú heag.)Bishop, O. N. Exploring FORTH. London: Granada, 1984.
Lua MLA (9ú heag.)Bishop, O. N. Exploring FORTH. Granada, 1984.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.