Hellström, P., & Langballe, H. (1970). The rock drawings. [s.l.: The Scandinavian Joint Expedition to Sudanese Nubia.
استشهاد بنمط شيكاغوHellström, Pontus., و Hans Langballe. The Rock Drawings. [s.l.: The Scandinavian Joint Expedition to Sudanese Nubia, 1970.
MLA استشهادHellström, Pontus., و Hans Langballe. The Rock Drawings. [s.l.: The Scandinavian Joint Expedition to Sudanese Nubia, 1970.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.