APA (7th ed.) Citation

Bunyan, J., Jepson, R. W., & Boulter, B. C. (1961). The pilgrim's progress. Longmans, Green.

Chicago Style (17th ed.) Citation

Bunyan, John, R. W. Jepson, and B. C. Boulter. The Pilgrim's Progress. London [etc.]: Longmans, Green, 1961.

MLA (9th ed.) Citation

Bunyan, John, et al. The Pilgrim's Progress. Longmans, Green, 1961.