Tohutoro APA (7th ed.)
Ahti, T. (1967). The Dryopteris Spinulosa Complex in Finland.
Tohutoru Kātū Chicago (17th ed.)
Ahti, Teuvo. The Dryopteris Spinulosa Complex in Finland. 1967.
Tohutoro MLA (9th ed.)
Ahti, Teuvo. The Dryopteris Spinulosa Complex in Finland. 1967.
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