Veronique Greenwood. „The little-known nut that gave Coca-Cola its name“. BBC News - Future (2016-yil 23-sentyabr). Qaraldi: 2019-yil 23-dekabr. „These days, the Coca-Cola recipe is a closely guarded secret. But it's said to no longer contain kola nut extract, relying instead on artificial imitations to achieve the flavour“.
