APA

Tyrrell A., Lake L. & Parsons A. (1983). Investigation of the extra costs arising on highway contracts. Crowthorne: Transport and Road Research Laboratory. Supplementary report 814.

Chicago

Tyrrell AP, Lake LM and Parsons AW. 1983. Investigation of the extra costs arising on highway contracts. Crowthorne: Transport and Road Research Laboratory. Supplementary report 814.

Harvard

Tyrrell A., Lake L. and Parsons A. (1983). Investigation of the extra costs arising on highway contracts. Crowthorne: Transport and Road Research Laboratory. Supplementary report 814.

MLA

Tyrrell AP, Lake LM and Parsons AW. Investigation of the extra costs arising on highway contracts. Crowthorne: Transport and Road Research Laboratory. Supplementary report 814. 1983.