Voretus is correct this is not an appropriate external link
I have checked the guidelines and think this link is highly relevant
also I want to add that I haven’t found a better article which tackles “'ontogenesis recapitulates phylogenesis' postulate”
There are also some extremely important quotes about Jung's Nazi involvement. I think the Link is worth just for those quotes (check the notes)
I think they are highly relevant to the whole corpus.
I am sure they cannot be included in the main Encyclopedia article but a link serves good in such a case.

please correct me if I am wrong.