Origanum vulgare - http://ip30.eti.uva.nl/bis/flora.php?selected=beschrijving&menuentry=soorten&id=3511 Photograph, classification, diagnostic features, habitat and distribution of wild marjoram.
Oregano - http://www.ipgri.cgiar.org/publications/pdf/199.pdf International Plant Genetic Resources Institute proceedings volume dealing with the taxonomy, distribution, origin, conservation, cultivation and commercial production of genus Origanum.
Origanum vulgare 'Aureum' - http://www.mobot.org/gardeninghelp/plantfinder/Plant.asp?code=A251 Photograph and horticultural data.
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