APA
International Society for Rock Mechanics, . (1970). Rock Mechanics. Congress. 2. Belgrad, 1970. Proceedings. Belgrad: International Society for Rock Mechanics.
Chicago
International Society for Rock Mechanics, . 1970. Rock Mechanics. Congress. 2. Belgrad, 1970. Proceedings. Belgrad: International Society for Rock Mechanics.
Harvard
International Society for Rock Mechanics, . (1970). Rock Mechanics. Congress. 2. Belgrad, 1970. Proceedings. Belgrad: International Society for Rock Mechanics.
MLA
International Society for Rock Mechanics, . Rock Mechanics. Congress. 2. Belgrad, 1970. Proceedings. Belgrad: International Society for Rock Mechanics. 1970.