APA (7th ed.) Citation

Political and Economic Planning, Pinder, & Henig. (1969). European political parties. Allen & Unwin.

Chicago Style (17th ed.) Citation

Political and Economic Planning, Pinder, and Henig. European Political Parties. London: Allen & Unwin, 1969.

MLA (8th ed.) Citation

Political and Economic Planning, et al. European Political Parties. Allen & Unwin, 1969.