APA (7th ed.) Citation

Willman, H. B. (1942). Feldspar in Illinois sands, a study of resources. [publisher not identified].

Chicago Style (17th ed.) Citation

Willman, H. B. Feldspar in Illinois Sands, a Study of Resources. Urbana, Illinois: [publisher not identified], 1942.

MLA (9th ed.) Citation

Willman, H. B. Feldspar in Illinois Sands, a Study of Resources. [publisher not identified], 1942.

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