APA (7th ed.) Citation

Steele, P. (1988). 64 Clipper user-defined functions. TAB Books.

Chicago Style (17th ed.) Citation

Steele, Philip. 64 Clipper User-defined Functions. Blue Ridge Summit, PA: TAB Books, 1988.

MLA (9th ed.) Citation

Steele, Philip. 64 Clipper User-defined Functions. TAB Books, 1988.