Geologinen tutkimuslaitos (Finland), Okko, M., & Hannikainen, M. (1960). Guide to the publications of the Geological Survey of Finland 1879-1960. Geolgocial Survey of Finland.
Lua i Stíl Chicago (17ú heag.)Geologinen tutkimuslaitos (Finland), Marjatta Okko, agus Marjetta Hannikainen. Guide to the Publications of the Geological Survey of Finland 1879-1960. Helsinki: Geolgocial Survey of Finland, 1960.
Lua MLA (8ú heag.)Geologinen tutkimuslaitos (Finland), et al. Guide to the Publications of the Geological Survey of Finland 1879-1960. Geolgocial Survey of Finland, 1960.
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