I spy,
by Natalie Summer Lincoln ; with frontispiece by Charles L. Wrenn.

APA Citation

Lincoln, N. Sumner. (1916). I spy. New York: Burt.

MLA Citation

Lincoln, Natalie Sumner, 1881-1935. I Spy. New York: Burt, 1916.

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