APA

Helsdingen P J Van, Willemse L, . (1996). Background information on inverbrates of the habitats directives and the Bern convention. Part . I : Crustacea, Coleoptera and Lepidoptera. Strasbourg: Council of Europe.

Chicago

Helsdingen P J Van, Willemse L, . 1996. Background information on inverbrates of the habitats directives and the Bern convention. Part . I : Crustacea, Coleoptera and Lepidoptera. Strasbourg: Council of Europe.

Harvard

Helsdingen P J Van, Willemse L, . (1996). Background information on inverbrates of the habitats directives and the Bern convention. Part . I : Crustacea, Coleoptera and Lepidoptera. Strasbourg: Council of Europe.

MLA

Helsdingen P J Van, Willemse L, . Background information on inverbrates of the habitats directives and the Bern convention. Part . I : Crustacea, Coleoptera and Lepidoptera. Strasbourg: Council of Europe. 1996.