APA (7th ed.) Citation

(1930). Twentieth-century poetry. Houghton Mifflin Comp. [u.a.].

Chicago Style (17th ed.) Citation

Twentieth-century Poetry. Cambridge: Houghton Mifflin Comp. [u.a.], 1930.

MLA (9th ed.) Citation

Twentieth-century Poetry. Houghton Mifflin Comp. [u.a.], 1930.