Fries, T. M. (1861). Genera heterolichenum Europaea recognita. Edquist.
Chicago Style (17th ed.) CitationFries, Theodor Magnus. Genera Heterolichenum Europaea Recognita. Upsaliae: Edquist, 1861.
MLA (8th ed.) CitationFries, Theodor Magnus. Genera Heterolichenum Europaea Recognita. Edquist, 1861.
Warning: These citations may not always be 100% accurate.