How to draw three-dimensional structures on two-dimensional paper

Brecher J. 2006. Graphical representation of stereochemical configuration Pure and Applied Chemistry 78(10):1897-1970. doi:10.1351/pac200678101897

Recommendations are provided for the display of three-dimensional stereochemical information in two-dimensional diagrams in ways that avoid ambiguity and are likely to be understood correctly by all viewers. Examples are provided for all types of stereochemical configuration, with explanation of which styles are preferred and which should be avoided.

http://www.iupac.org/publications/pac/2006/pdf/7810×1897.pdf