The Causal Relationship Between Internal Motivation and Learning Readiness With the Cognitive Learning Achievement in Learning Biology at SMA Negeri 1 Cawas in Class Year of 2011/2012 - Suviana, Novita Tyas; P.Biologi FKIP UNS (Pendidikan Biologi FKIP Universitas Sebelas Maret, 2012)