APA (7th ed.) Citation

Allen, M. (1973). Portrait photography : how and why / (by) Mary Allen: How and why. Focal Press.

Chicago Style (17th ed.) Citation

Allen, Mary. Portrait Photography : How and Why / (by) Mary Allen: How and Why. London: Focal Press, 1973.

MLA (9th ed.) Citation

Allen, Mary. Portrait Photography : How and Why / (by) Mary Allen: How and Why. Focal Press, 1973.

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