APA (7th ed.) Citation

Fries, T. M. (1861). Genera heterolichenum Europaea recognita. Edquist.

Chicago Style (17th ed.) Citation

Fries, Theodor Magnus. Genera Heterolichenum Europaea Recognita. Upsaliae: Edquist, 1861.

MLA (8th ed.) Citation

Fries, Theodor Magnus. Genera Heterolichenum Europaea Recognita. Edquist, 1861.