APA

Emsley M. G., . (1965). Speciation in Heliconius (Lep., Nymphalidae). New York: s.n.

Chicago

Emsley Michael G, . 1965. Speciation in Heliconius (Lep., Nymphalidae). New York: s.n.

Harvard

Emsley M. G., . (1965). Speciation in Heliconius (Lep., Nymphalidae). New York: s.n.

MLA

Emsley Michael G, . Speciation in Heliconius (Lep., Nymphalidae). New York: s.n. 1965.