Singh, B., & Goel, R. K. (2011). Engineering rock mass classification: Tunnelling, foundations, and landslides. Butterworth-Heinemann.
Citazione stile Chigago Style (17a edizione)Singh, Bhawani, e R. K. Goel. Engineering Rock Mass Classification: Tunnelling, Foundations, and Landslides. Burlington, Mass.: Butterworth-Heinemann, 2011.
Citatione MLA (9a ed.)Singh, Bhawani, e R. K. Goel. Engineering Rock Mass Classification: Tunnelling, Foundations, and Landslides. Butterworth-Heinemann, 2011.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.