No complicated links should not be used in paperbacks. The only links which are allowed are links which are easy to read and easy to type without error. If a link is complicated, it may be better to tell people how to find it, eg: Search Google for ‘Bernard Williams’ integrity objection to utilitarian ethics’

Not allowed: 

• https://www.youtube.com/watch?v=xwOCmJevigw
• https://catalog.flatworldknowledge.com/bookhub/1695?e=brusseau-ch02_s03

Allowed:

• https://lucidmanager.org/essays/milton-friedman/
• http://www.catholicsandcontraception.com/humanae-vitae-in-catholic-clairs-life/