APA

Williams G., . (1976). Design heat requirements for embedded snow-melting systems in cold climates. ( Transportation Research Record nr 576, s 20-32). Ottawa: National Research Council Canada. DBR paper nr 715.

Chicago

Williams GP, . 1976. Design heat requirements for embedded snow-melting systems in cold climates. ( Transportation Research Record nr 576, s 20-32). Ottawa: National Research Council Canada. DBR paper nr 715.

Harvard

Williams G., . (1976). Design heat requirements for embedded snow-melting systems in cold climates. ( Transportation Research Record nr 576, s 20-32). Ottawa: National Research Council Canada. DBR paper nr 715.

MLA

Williams GP, . Design heat requirements for embedded snow-melting systems in cold climates. ( Transportation Research Record nr 576, s 20-32). Ottawa: National Research Council Canada. DBR paper nr 715. 1976.