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Չիկագոյի ոճի (17րդ խմբ.) մեջբերումU.S. National Committee for Rock Mechanics, National Research Council (U.S.). Panel on Borehole Stability, National Research Council (U.S.). Geotechnical Board, National Research Council (U.S.). Commission on Engineering and Technical Systems, and Jean-Claude Roegiers. Stability, Failure, and Measurements of Boreholes and Other Circular Openings. Washington, DC: National Academy Press, 1993.
MLA (9րդ խմբ.) ՄեջբերումU.S. National Committee for Rock Mechanics, et al. Stability, Failure, and Measurements of Boreholes and Other Circular Openings. National Academy Press, 1993.