APA (7th ed.) Citation

Piskin, K., & Bergstrom, R. E. (1967). Glacial drift in Illinois: Thickness and character. [publisher not identified].

Chicago Style (17th ed.) Citation

Piskin, Kemal, and Robert Edward Bergstrom. Glacial Drift in Illinois: Thickness and Character. Urbana: [publisher not identified], 1967.

MLA (9th ed.) Citation

Piskin, Kemal, and Robert Edward Bergstrom. Glacial Drift in Illinois: Thickness and Character. [publisher not identified], 1967.

Warning: These citations may not always be 100% accurate.