US Forest Service Silvics Manual*"Acer saccharum" at Ohio State Horticulture & Crop Sciences*"Acer saccharum" images at bioimages.vanderbilt.edu*Winter ID Pictures*Historic Photos and Technical Reports Documenting Sugar Maple Research, from digital archives at the University of Vermont.
V biologiji, mutagen (dobesedno "sprememba izvora") je fizični ali kemični faktor, ki spreminja genetski material, po navadi DNK, organizma in s tem poveča pogostost mutacij naravnega sistema.