APA
Mary D. Sheridan, . (1977). Spontaneous Play In Early Childhood from birth to six years. Berkshire: Nfer Publishing Company.
Chicago
Mary D. Sheridan, . 1977. Spontaneous Play In Early Childhood from birth to six years. Berkshire: Nfer Publishing Company.
Harvard
Mary D. Sheridan, . (1977). Spontaneous Play In Early Childhood from birth to six years. Berkshire: Nfer Publishing Company.
MLA
Mary D. Sheridan, . Spontaneous Play In Early Childhood from birth to six years. Berkshire: Nfer Publishing Company. 1977.
