Kim, M.J.; Moon, Y.; Kopsell, D.A.; Park, S.; Tou, J.C.; Waterland, N.L. Nutritional value of crisphead `Iceberg' and romaine lettuces (Lactuca sativa L.). J. Agric. Sci. 2016, 8. [CrossRef]Kim, M. J., Moon, Y., Kopsell, D. A., Park, S. P., Tou, J. C...
Lettuce comes in a variety of colors, sizes, and shapes, and therefore they are grouped into six main types based on the leaf shape, size, texture, head formation, and stem type [31], i.e., crisphead lettuce, butterhead lettuce, romaine or cos lettuce, leaf or cutting lettuce, stem ...