APA (7th ed.) Citation

Graber, R. R., & Graber, J. W. (1963). A comparative study of bird populations in Illinois: 1906 - 1909 and 1956 - 1958. Dep. of Registration and Education, Natural History Survey Division.

Chicago Style (17th ed.) Citation

Graber, Richard R., and Jean W. Graber. A Comparative Study of Bird Populations in Illinois: 1906 - 1909 and 1956 - 1958. Urbana, Ill: Dep. of Registration and Education, Natural History Survey Division, 1963.

MLA (9th ed.) Citation

Graber, Richard R., and Jean W. Graber. A Comparative Study of Bird Populations in Illinois: 1906 - 1909 and 1956 - 1958. Dep. of Registration and Education, Natural History Survey Division, 1963.