Cita APA (7th ed.)
Widén, C., Sorsa, V., & Sarvela, J. (1970). Dryopteris dilatata s.lat. in Europe and the island of Madeira: A chromatographic and cytological study. Soc. pro fauna et flora Fennica.
Cita Chicago (17th ed.)
Widén, Carl-Johan, Veikko Sorsa, i Jaakko Sarvela. Dryopteris Dilatata S.lat. in Europe and the Island of Madeira: A Chromatographic and Cytological Study. Helsinki: Soc. pro fauna et flora Fennica, 1970.
Cita MLA (9th ed.)
Widén, Carl-Johan, et al. Dryopteris Dilatata S.lat. in Europe and the Island of Madeira: A Chromatographic and Cytological Study. Soc. pro fauna et flora Fennica, 1970.
Atenció: Aquestes cites poden no estar 100% correctes.