Spiller, R. E. (1963). The cycle of American literature: An essay in historical criticism (6th print.). New American Library.
Lua i Stíl Chicago (17ú heag.)Spiller, Robert Ernest. The Cycle of American Literature: An Essay in Historical Criticism. 6th print. New York: New American Library, 1963.
Lua MLA (8ú heag.)Spiller, Robert Ernest. The Cycle of American Literature: An Essay in Historical Criticism. 6th print. New American Library, 1963.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.