NCBI.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3565342/
Diakses pada 12 Maret 2020Health Benefit Times.
https://www.healthbenefitstimes.com/tulip-tree/
Diakses pada 12 Maret 2020Science Direct.
https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/liriodendron-tulipifera
Diakses pada 12 Maret 2020Fdokumen.
https://fdokumen.com/document/rekayasa-genetika-pigmen-flavonoid-untuk-memodifikasi-warna-bunga-pada-tanaman-floricultural.html
Diakses pada 12 Maret 2020Verywell Health.
https://www.verywellhealth.com/the-scoop-on-anthocyanins-89522
Diakses pada 12 Maret 2020Healthline.
https://www.healthline.com/health/what-are-flavonoids-everything-you-need-to-know
Diakses pada 12 Maret 2020BHG.
https://www.bhg.com/gardening/flowers/facts-about-tulips/
Diakses pada 12 Maret 2020