APA

Hildick E. W., . (1980). The case of the snowbound spy. New York: Macmillan Publishing Co.

Chicago

Hildick E W, . 1980. The case of the snowbound spy. New York: Macmillan Publishing Co.

Harvard

Hildick E. W., . (1980). The case of the snowbound spy. New York: Macmillan Publishing Co.

MLA

Hildick E W, . The case of the snowbound spy. New York: Macmillan Publishing Co. 1980.