APA

Cripps J., . (1993). The engineering geology of weak rock. 26th annual conference of the engineering group of the Geological Society, Leeds, United Kingdom, 9-13 September 1990. Proceedings. Rotterdam: Balkema. Engineering geology special publication 8.

Chicago

Cripps JC, . 1993. The engineering geology of weak rock. 26th annual conference of the engineering group of the Geological Society, Leeds, United Kingdom, 9-13 September 1990. Proceedings. Rotterdam: Balkema. Engineering geology special publication 8.

Harvard

Cripps J., . (1993). The engineering geology of weak rock. 26th annual conference of the engineering group of the Geological Society, Leeds, United Kingdom, 9-13 September 1990. Proceedings. Rotterdam: Balkema. Engineering geology special publication 8.

MLA

Cripps JC, . The engineering geology of weak rock. 26th annual conference of the engineering group of the Geological Society, Leeds, United Kingdom, 9-13 September 1990. Proceedings. Rotterdam: Balkema. Engineering geology special publication 8. 1993.