APA

Stephenson D., . (1977). Preventing exposed water pipes from freezing. Ottawa: National Research Council Canada. Building Research Note nr 120.

Chicago

Stephenson DG, . 1977. Preventing exposed water pipes from freezing. Ottawa: National Research Council Canada. Building Research Note nr 120.

Harvard

Stephenson D., . (1977). Preventing exposed water pipes from freezing. Ottawa: National Research Council Canada. Building Research Note nr 120.

MLA

Stephenson DG, . Preventing exposed water pipes from freezing. Ottawa: National Research Council Canada. Building Research Note nr 120. 1977.