Gray, J.A. Elements of a two-process theory of learning - Academic Press London 1975 - x,423,tables - Habituation Reinforcement ISBN: 0-12-296850-6 = Gray, J.A. Standard No.: M Standard Tech. Report. No.: LCCN: B Nat. Bib. No.: 2620 Nat. Bib. Agency Control No.: 159.953 GRA Subjects--Topical Terms: Psychology Universal Decimal Class. No.: 159.953