APA (7th ed.) Citation

(1999). Color harmony workbook: A workbook and guide to creative color combinations (1. publ.). Olms.

Chicago Style (17th ed.) Citation

Color Harmony Workbook: A Workbook and Guide to Creative Color Combinations. 1. publ. Zürich: Olms, 1999.

MLA (9th ed.) Citation

Color Harmony Workbook: A Workbook and Guide to Creative Color Combinations. 1. publ. Olms, 1999.

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