APA

Transportation Research Record nr 612, . (1976). Subsidence over mines and caverns, moisture and frost actions and classification. Washington DC: Transportation Research Record nr 612.

Chicago

Transportation Research Record nr 612, . 1976. Subsidence over mines and caverns, moisture and frost actions and classification. Washington DC: Transportation Research Record nr 612.

Harvard

Transportation Research Record nr 612, . (1976). Subsidence over mines and caverns, moisture and frost actions and classification. Washington DC: Transportation Research Record nr 612.

MLA

Transportation Research Record nr 612, . Subsidence over mines and caverns, moisture and frost actions and classification. Washington DC: Transportation Research Record nr 612. 1976.