Krouwel ,Bill. (1996). out door training. Viva Books.
Lua i Stíl Chicago (17ú heag.)Krouwel ,Bill. Out Door Training. Delhi: Viva Books, 1996.
Lua MLA (9ú heag.)Krouwel ,Bill. Out Door Training. Viva Books, 1996.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.