APA

Frey S. W., . (1998). The Inner Sanctum. London: Penguin.

Chicago

Frey Stephen W, . 1998. The Inner Sanctum. London: Penguin.

Harvard

Frey S. W., . (1998). The Inner Sanctum. London: Penguin.

MLA

Frey Stephen W, . The Inner Sanctum. London: Penguin. 1998.