Play as a learning medium, c1974.

Her Your child and Play, 1981: t.p. (Doris Bergen Sponseller; Ph. D.; U.S. Dept. of Health and Human Services, Head Start Bureau) [info. from GPO]

Play as a medium for learning and development, c1987: CIP t.p. (Doris Bergen; Dept. of Psychology and Counseling, Pittsburg State Univ.)

Phone call to publisher, 11/14/86 (author now using name: Doris Bergen)

Assessment methods for infants and toddlers, c1994: CIP t.p. (Doris Bergen) data sheet (b. 2/11/32)