APA (7th ed.) Citation

Freud, S., Freud, A., Strachey, J., & Tyson, A. (2001). Two case histories: 'Little Hans' and the 'Rat Man': (1909). Vintage.

Chicago Style (17th ed.) Citation

Freud, Sigmund, Anna Freud, James Strachey, and Alan Tyson. Two Case Histories: 'Little Hans' and the 'Rat Man': (1909). London: Vintage, 2001.

MLA (8th ed.) Citation

Freud, Sigmund, et al. Two Case Histories: 'Little Hans' and the 'Rat Man': (1909). Vintage, 2001.