APA

Grigg A., Huddart L., . (1979). An opinion survey of the Yorkshire Dales rail service in 1977. Crowthorne: Transport and Road Research Laboratory. Laboratory report no 906.

Chicago

Grigg AO, Huddart L, . 1979. An opinion survey of the Yorkshire Dales rail service in 1977. Crowthorne: Transport and Road Research Laboratory. Laboratory report no 906.

Harvard

Grigg A., Huddart L., . (1979). An opinion survey of the Yorkshire Dales rail service in 1977. Crowthorne: Transport and Road Research Laboratory. Laboratory report no 906.

MLA

Grigg AO, Huddart L, . An opinion survey of the Yorkshire Dales rail service in 1977. Crowthorne: Transport and Road Research Laboratory. Laboratory report no 906. 1979.