Maud Grieve (1971). “A Modern Herbal: The Medicinal, Culinary, Cosmetic and Economic Properties, Cultivation and Folk-lore of Herbs, Grasses, Fungi, Shrubs, & Trees with All Their Modern Scientific Uses”, p.475, Courier Corporation
"Yotam Ottolenghi's recipes for purple-sprouting broccoli with olive oil mash, plus scallops and jerusalem artichokes with celery and lemon" by Yotam Ottolenghi, www.theguardian.com. February 17, 2012.