Cita APA (7th ed.)

Gosler, A., Gosler, A., & Perrins, C. (1987). Some aspects of bill morphology in relation to ecology in the great tit Parus major.

Cita Chicago (17th ed.)

Gosler, A., Andrew Gosler, i C. Perrins. Some Aspects of Bill Morphology in Relation to Ecology in the Great Tit Parus Major. 1987.

Cita MLA (9th ed.)

Gosler, A., et al. Some Aspects of Bill Morphology in Relation to Ecology in the Great Tit Parus Major. 1987.