Graber, J. W., Graber, R. R., & Kirk, E. L. Illinois birds. State of Illinois, Dept. of Registration and Education, Natural History Survey Division, Illinois Natural History Survey.
Chicago-Zitierstil (17. Ausg.)Graber, Jean W., Richard R. Graber, und Ethelyn L. Kirk. Illinois Birds. Urbana, Ill: State of Illinois, Dept. of Registration and Education, Natural History Survey Division, Illinois Natural History Survey.
MLA-Zitierstil (9. Ausg.)Graber, Jean W., et al. Illinois Birds. State of Illinois, Dept. of Registration and Education, Natural History Survey Division, Illinois Natural History Survey.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.