Voorhoeve, P. (1955). Critical survey of studies on the languages of Sumatra. Martinus Nijhoff.
Lua i Stíl Chicago (17ú heag.)Voorhoeve, Petrus. Critical Survey of Studies on the Languages of Sumatra. 'S-Gravenhage: Martinus Nijhoff, 1955.
Lua MLA (9ú heag.)Voorhoeve, Petrus. Critical Survey of Studies on the Languages of Sumatra. Martinus Nijhoff, 1955.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.