Heiser, J., & Hakansson, H. (2003). Henrik Hakansson: An introduction to the birds.
Lua i Stíl Chicago (17ú heag.)Heiser, Jörg, agus Henrik Hakansson. Henrik Hakansson: An Introduction to the Birds. Amsterdam [u.a.], 2003.
Lua MLA (8ú heag.)Heiser, Jörg, agus Henrik Hakansson. Henrik Hakansson: An Introduction to the Birds. 2003.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.