APA (7th ed.) Citation

Ekelöf, G., Rukeyser, M., & Sjöberg, L. (1967). Selected poems. Twayne.

Chicago Style (17th ed.) Citation

Ekelöf, Gunnar, Muriel Rukeyser, and Leif Sjöberg. Selected Poems. New York: Twayne, 1967.

MLA (9th ed.) Citation

Ekelöf, Gunnar, et al. Selected Poems. Twayne, 1967.