APA

Yardley D C M,, . (1986). Principles of administrative law. London: Butterworths.

Chicago

Yardley D C M,, . 1986. Principles of administrative law. London: Butterworths.

Harvard

Yardley D C M,, . (1986). Principles of administrative law. London: Butterworths.

MLA

Yardley D C M,, . Principles of administrative law. London: Butterworths. 1986.