APA (7th ed.) Citation

Lamm, H., Trommsdorff, G., & Kogan, N. (1969). Pessimism - optimism and risk taking in individual and group contexts. [s.n.].

Chicago Style (17th ed.) Citation

Lamm, Helmut, Gisela Trommsdorff, and Nathan Kogan. Pessimism - Optimism and Risk Taking in Individual and Group Contexts. Princeton, N.J: [s.n.], 1969.

MLA (9th ed.) Citation

Lamm, Helmut, et al. Pessimism - Optimism and Risk Taking in Individual and Group Contexts. [s.n.], 1969.