Patilla, P. (1990). Subtracting. Kingfisher Books.
Lua i Stíl Chicago (17ú heag.)Patilla, Peter. Subtracting. London: Kingfisher Books, 1990.
Lua MLA (9ú heag.)Patilla, Peter. Subtracting. Kingfisher Books, 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.