APA (7e ed.) Bronvermelding

Higgins, L. G., & Riley, N. D. (1970). A Field guide to the butterflies of Britain and Europe QL555 .A1 H. Collins.

Chicago (17e ed.) Bronvermelding

Higgins, Lionel George, en Norman Denbigh Riley. A Field Guide to the Butterflies of Britain and Europe QL555 .A1 H. London: Collins, 1970.

MLA (9e ed.) Bronvermelding

Higgins, Lionel George, en Norman Denbigh Riley. A Field Guide to the Butterflies of Britain and Europe QL555 .A1 H. Collins, 1970.