APA (7 ম সংস্করণ) উদ্ধৃতি

Haapala, P. (1936). On serpentine rocks in northern Karelia: With 21 figures in text and two maps. Government Press.

শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতি

Haapala, Paavo. On Serpentine Rocks in Northern Karelia: With 21 Figures in Text and Two Maps. Helsinki: Government Press, 1936.

M.L.A (8 ম সংস্করণ) উদ্ধৃতি

Haapala, Paavo. On Serpentine Rocks in Northern Karelia: With 21 Figures in Text and Two Maps. Government Press, 1936.