I wonder what they're doing to-night (your girl and mine)

Chicago citation style
Brown, Lew; Harriman, Al, Brown, Lew; Harriman, Al. I wonder what they're doing to-night (your girl and mine). 1918. Retrieved from the Digital Public Library of America, http://www.idaillinois.org/cdm/ref/collection/p16614coll23/id/660. (Accessed December 16, 2018.)
APA citation style
Brown, Lew; Harriman, Al, Brown, Lew; Harriman, Al, (1918) I wonder what they're doing to-night (your girl and mine). Retrieved from the Digital Public Library of America, http://www.idaillinois.org/cdm/ref/collection/p16614coll23/id/660
MLA citation style
Brown, Lew; Harriman, Al, Brown, Lew; Harriman, Al. Retrieved from the Digital Public Library of America <http://www.idaillinois.org/cdm/ref/collection/p16614coll23/id/660>.
Note: These citations are programmatically generated and may be incomplete.