APA (7th ed.) Citation

Yeats, W. B. (1921). Four years/ by William Butler Yeats. Cuala Press.

Chicago Style (17th ed.) Citation

Yeats, W. B. Four Years/ by William Butler Yeats. Dublin: Cuala Press, 1921.

MLA (9th ed.) Citation

Yeats, W. B. Four Years/ by William Butler Yeats. Cuala Press, 1921.

Warning: These citations may not always be 100% accurate.