APA (7th ed.) Citation

Jørgensen, P. M., & Ryvarden, L. (1970). Contribution to the lichen flora of Norway. Norwegian Univ. Press.

Chicago Style (17th ed.) Citation

Jørgensen, Per Magnus, and Leif Ryvarden. Contribution to the Lichen Flora of Norway. Bergen [u.a.]: Norwegian Univ. Press, 1970.

MLA (9th ed.) Citation

Jørgensen, Per Magnus, and Leif Ryvarden. Contribution to the Lichen Flora of Norway. Norwegian Univ. Press, 1970.