Cita APA (7a ed.)

Heiser, J., & Hakansson, H. (2003). Henrik Hakansson: An introduction to the birds.

Cita Chicago Style (17a ed.)

Heiser, Jörg, y Henrik Hakansson. Henrik Hakansson: An Introduction to the Birds. Amsterdam [u.a.], 2003.

Cita MLA (8a ed.)

Heiser, Jörg, y Henrik Hakansson. Henrik Hakansson: An Introduction to the Birds. 2003.