APA

,, . (1992). The conservation of European Orchids. Strasbourg: Council of Europe.

Chicago

,, . 1992. The conservation of European Orchids. Strasbourg: Council of Europe.

Harvard

,, . (1992). The conservation of European Orchids. Strasbourg: Council of Europe.

MLA

,, . The conservation of European Orchids. Strasbourg: Council of Europe. 1992.