1. Brazilian Standard Item 4.7.6.2.2 - Table 1;ABNT NBR 8800,2008
2. B31. Gas transmission and distribution piping systems;ASME Code for Pressure Piping;ASME B31.,2016
3. Edition 47;Caterpillar Performance Handbook,2017
4. Pipelines Statistics Reports for the World;CIA–Central Intelligence Agency–The World Factbook,2016