https://www.newworldencyclopedia.org/entry/Niko_Tinbergen
Nikolaas Tinbergen - New World Encyclopedia
nikolaas tinbergennew worldencyclopedia
https://wellcomecollection.org/works/bzky6spp
Supplementary catalogue of the papers and correspondence of Nikolaas Tinbergen FRS (1907-1988) / by...
Supplementary catalogue of the papers and correspondence of Nikolaas Tinbergen FRS (1907-1988) / by Adrian Nardone and Peter Harper.