APA (7th ed.) Citation

Walker, F. L., & Thoma, G. R. (1990). Access Techniques for Document Image Databases.

Chicago Style (17th ed.) Citation

Walker, Frank L., and George R. Thoma. Access Techniques for Document Image Databases. 1990.

MLA (9th ed.) Citation

Walker, Frank L., and George R. Thoma. Access Techniques for Document Image Databases. 1990.

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