What'll you do when you grow up? :
a book for very young people who haven't made up their minds /
Berta and Elmer Hader.

APA Citation

Hader, B., Harder, E. (1929). What'll you do when you grow up?: a book for very young people who haven't made up their minds. London: Longmans, Green and Co..

MLA Citation

Hader, Berta, and Elmer Harder. What'll You Do When You Grow Up?: a Book for Very Young People Who Haven't Made Up Their Minds. London: Longmans, Green and Co., 1929.

Warning: These citations may not always be complete (especially for serials).