Gaya APA

Swanson, C, P., Hurlock, E, B. (1980). Developmental psychology Life-span approach (ED 5). NewDelhi:: McGraw-Hill.

Gaya MLA

Swanson, Carl, P.., Hurlock, Elizabeth, B.. "Developmental psychology Life-span approach". ED 5 NewDelhi:: McGraw-Hill, 1980. Text.