Oey, E. M. (1996). Sumatra: Island of adventure ([2nd ed.].). Passport Books.
Lua i Stíl Chicago (17ú heag.)Oey, Eric M. Sumatra: Island of Adventure. [2nd ed.]. Lincolnwood, Ill: Passport Books, 1996.
Lua MLA (9ú heag.)Oey, Eric M. Sumatra: Island of Adventure. [2nd ed.]. Passport Books, 1996.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.