APA aipamena

Peiffer, V. (1990). Strategies of optimism: A practical guide to personal development. Element Books.

Chicago Style aipamena

Peiffer, Vera. Strategies of Optimism: A Practical Guide to Personal Development. Dorset, UK: Element Books, 1990.

MLA aipamena

Peiffer, Vera. Strategies of Optimism: A Practical Guide to Personal Development. Element Books, 1990.