Holden,Raymond P. The Ways of Nesting birds.
Chicago-viite (17. p.)Holden,Raymond P. The Ways of Nesting Birds.
MLA-viite (9. p.)Holden,Raymond P. The Ways of Nesting Birds.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.
Holden,Raymond P. The Ways of Nesting birds.
Chicago-viite (17. p.)Holden,Raymond P. The Ways of Nesting Birds.
MLA-viite (9. p.)Holden,Raymond P. The Ways of Nesting Birds.