Ragan, D. M. (2009). Structural geology: an introduction to: Geometrical techniques. Upr.
Chicago-čujuhus (17. p.)Ragan, Donal M. Structural Geology: An Introduction to: Geometrical Techniques. Cambridge: Upr, 2009.
MLA-čujuhus (9. p.)Ragan, Donal M. Structural Geology: An Introduction to: Geometrical Techniques. Upr, 2009.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.