Labor problems :
a text book /
by Thomas Sewall Adams and Helen L. Sumner.
APA Citation
Adams, T. Sewall., Sumner, H. L. (Helen Laura). (1909). Labor problems: a text book. 6th ed. New York: Macmillan.
MLA Citation
Adams, Thomas Sewall, 1873-1933, and Helen L. (Helen Laura) Sumner. Labor Problems: a Text Book. 6th ed. New York: Macmillan, 1909.
Warning: These citations may not always be complete (especially for serials).