APA (7th ed.) Citation

National Research Council (U.S.). Rock-Color Chart Committee. (1948). Rock-color chart. [publisher not identified].

Chicago Style (17th ed.) Citation

National Research Council (U.S.). Rock-Color Chart Committee. Rock-color Chart. Washington: [publisher not identified], 1948.

MLA (9th ed.) Citation

National Research Council (U.S.). Rock-Color Chart Committee. Rock-color Chart. [publisher not identified], 1948.

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