APA

Nutt D., Argyropoulos S. & Forshall S. (1998). Generalized anxiety disorder. London: Martin Dunitz.

Chicago

Nutt David, Argyropoulos Spilios and Forshall Sam. 1998. Generalized anxiety disorder. London: Martin Dunitz.

Harvard

Nutt D., Argyropoulos S. and Forshall S. (1998). Generalized anxiety disorder. London: Martin Dunitz.

MLA

Nutt David, Argyropoulos Spilios and Forshall Sam. Generalized anxiety disorder. London: Martin Dunitz. 1998.