APA (7th ed.) Citation

Porter, P. (1978). The cost of seriousness / (by) Peter Porter. Oxford University Press.

Chicago Style (17th ed.) Citation

Porter, Peter. The Cost of Seriousness / (by) Peter Porter. Oxford (etc.): Oxford University Press, 1978.

MLA (9th ed.) Citation

Porter, Peter. The Cost of Seriousness / (by) Peter Porter. Oxford University Press, 1978.

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