Media type: E-Article Title: Convergent and discriminant validation of three classroom observation systems: A proposed model Contributor: Borich, Gary D.; Malitz, David Published: American Psychological Association (APA), 1975 Published in: Journal of Educational Psychology, 67 (1975) 3, Seite 426-431 Language: English DOI: 10.1037/h0076606 ISSN: 1939-2176; 0022-0663 Keywords: Developmental and Educational Psychology ; Education Origination: Footnote: