The Penguin book of English pastoral verse /
introduced and edited by John Barrell and John Bull.

APA Citation

Bull, J., Barrell, J. (1974). The Penguin book of English pastoral verse. London: Allen Lane.

MLA Citation

Bull, John, and John Barrell. The Penguin Book of English Pastoral Verse. London: Allen Lane, 1974.

Warning: These citations may not always be complete (especially for serials).