The animal alphabet (p. [21])

Chicago citation style
Cady, Harrison, 1877-1970. The animal alphabet (p. [21]). 1921. Retrieved from the Digital Public Library of America, http://cdm16786.contentdm.oclc.org/cdm/ref/collection/childrens/id/494. (Accessed September 24, 2018.)
APA citation style
Cady, Harrison, 1877-1970, (1921) The animal alphabet (p. [21]). Retrieved from the Digital Public Library of America, http://cdm16786.contentdm.oclc.org/cdm/ref/collection/childrens/id/494
MLA citation style
Cady, Harrison, 1877-1970. Retrieved from the Digital Public Library of America <http://cdm16786.contentdm.oclc.org/cdm/ref/collection/childrens/id/494>.
Note: These citations are programmatically generated and may be incomplete.