APA (7th ed.) Citation

Yach, D. (1989). WATCOM GKS graphics: Tutorial and reference (4. ed.). WATCOM Publ. Ltd.

Chicago Style (17th ed.) Citation

Yach, David. WATCOM GKS Graphics: Tutorial and Reference. 4. ed. Waterloo, Ontario: WATCOM Publ. Ltd, 1989.

MLA (9th ed.) Citation

Yach, David. WATCOM GKS Graphics: Tutorial and Reference. 4. ed. WATCOM Publ. Ltd, 1989.