APA (7th ed.) Citation

International Society for Rock Mechanics. Commission on Classification of Rocks and Rock Masses. (1980). Basic geotechnical description of rock masses. The Society.

Chicago Style (17th ed.) Citation

International Society for Rock Mechanics. Commission on Classification of Rocks and Rock Masses. Basic Geotechnical Description of Rock Masses. Lisbon, Portugal: The Society, 1980.

MLA (8th ed.) Citation

International Society for Rock Mechanics. Commission on Classification of Rocks and Rock Masses. Basic Geotechnical Description of Rock Masses. The Society, 1980.