Παραπομπή σε μορφή APA (7η εκδ.)

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

Παραπομπή σε μορφή Chicago (17η εκδ.)

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

Παραπομπή σε μορφή MLA (8th εκδ.)

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