International
Tables for Crystallography Volume A Spacegroup symmetry Edited by Th. Hahn © International Union of Crystallography 2006 
International Tables for Crystallography (2006). Vol. A. ch. 8.1, p. 721
Figure 8.1.2.1^{a}Institut für Kristallographie, Universität, D76128 Karlsruhe, Germany 

Figure 8.1.2.1
Representation of the point X with respect to origin O by the vector . The vector x is described with respect to the vector basis of by the coefficients . The coordinate system of the point space consists of the point O of and the vector basis of . 