International
Tables for Crystallography Volume C Mathematical, physical and chemical tables Edited by E. Prince © International Union of Crystallography 2006 
International Tables for Crystallography (2006). Vol. C, ch. 9.2, p. 756


Figure 9.2.1.8
The relationship between the f.c.c. and the primitive rhombohedral unit cell of the c.c.p. structure. 