Observing behavior /  : proceedings of the conference, Application of observational/ethological methods to the study of mental retardation, held at Lake Wilderness, Washington in June, 1976 / 
edited by Gene P. Sackett ; jointly sponsored by the National Institute of Child Health and Human Development of the United States Public Health Services, and by the Child Development and Mental Retardation Center of the University of Washington. 
 - Baltimore :  University Park Press,  1978. 
 - 2 v. :   ill. ;   25 cm. 
 - NICHD-Mental retardation research centers series. .
<br/><br/>Includes bibliographies and indexes. 
<br/><br/>v. 1. Theory and applications in mental retardation.--v. 2. Data collection and analysis methods. 
<br/><br/><label>ISBN: </label>0839111673  (v.1)0839111681  (v.2) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mental retardation--Research--Congresses.