APA

Ponchaud R D, . (1980). Light in action. Slough: University Tutorial Press.

Chicago

Ponchaud R D, . 1980. Light in action. Slough: University Tutorial Press.

Harvard

Ponchaud R D, . (1980). Light in action. Slough: University Tutorial Press.

MLA

Ponchaud R D, . Light in action. Slough: University Tutorial Press. 1980.