Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page Aromatic compound:

"

For example, three isomers exist for cresol because the methyl group and the hydroxyl group (both ortho para directors) can be placed next to each other (ortho), one position removed from each other (meta), or two positions removed from each other (para).[4] Given that both the methyl and hydroxyl group are ortho-para directors, the ortho and para isomers are typically favoured.[4] Xylenol has two methyl groups in addition to the hydroxyl group, and, for this structure, 6 isomers exist.[citation needed]