APA

Helsdingen P J Van, Willemse L, . (1996). Background information on invertebrates of the habitats directive and the Bern convention. Part. II : Mantodea, Odonata, Orthoptera and Arachnida. Sttrasbourg: Council of Europe.

Chicago

Helsdingen P J Van, Willemse L, . 1996. Background information on invertebrates of the habitats directive and the Bern convention. Part. II : Mantodea, Odonata, Orthoptera and Arachnida. Sttrasbourg: Council of Europe.

Harvard

Helsdingen P J Van, Willemse L, . (1996). Background information on invertebrates of the habitats directive and the Bern convention. Part. II : Mantodea, Odonata, Orthoptera and Arachnida. Sttrasbourg: Council of Europe.

MLA

Helsdingen P J Van, Willemse L, . Background information on invertebrates of the habitats directive and the Bern convention. Part. II : Mantodea, Odonata, Orthoptera and Arachnida. Sttrasbourg: Council of Europe. 1996.