Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

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