APA

Ingoldby H., Parsons A., . (1977). The classification of chalk for use as a fill material. Crowthorne: Transport and Road Research Laboratory. Lab. report nr 806.

Chicago

Ingoldby HC, Parsons AW, . 1977. The classification of chalk for use as a fill material. Crowthorne: Transport and Road Research Laboratory. Lab. report nr 806.

Harvard

Ingoldby H., Parsons A., . (1977). The classification of chalk for use as a fill material. Crowthorne: Transport and Road Research Laboratory. Lab. report nr 806.

MLA

Ingoldby HC, Parsons AW, . The classification of chalk for use as a fill material. Crowthorne: Transport and Road Research Laboratory. Lab. report nr 806. 1977.