Berg, R. V., & Wiebe, B. (2019). Data papers on Papua New Guinea languages: Bola Grammar sketch. SIL-PNG Academic Publications.
Chicago Style (17th ed.) CitationBerg, Rene Vanden, and Brent Wiebe. Data Papers on Papua New Guinea Languages: Bola Grammar Sketch. Ukarumpa, Papua New Guinea: SIL-PNG Academic Publications, 2019.
MLA (9th ed.) CitationBerg, Rene Vanden, and Brent Wiebe. Data Papers on Papua New Guinea Languages: Bola Grammar Sketch. SIL-PNG Academic Publications, 2019.
Warning: These citations may not always be 100% accurate.