1. Anonymous, 2003: Magyar Takarmány Kódex (Hungarian Fodder Cődex), Földművelésügyi Minisztérium (Ministry of Agriculture) and Mezőgazdasági Minősítő Intézet (National Institute for Agricultural Quality Control, Budapest, 201–202.
2. Al-Chalabi, A. S. and Hawker, D., 2000: Distribution of vehicular lead in roadside soils of major roads of Brisbane, Australia, Water Air Soil Pollut. 118(3–4), 299–310.
3. Al-Shayeb, S. M. and Seaward, M. R. D., 2001: Heavy metal content of roadside soils along ring road in riyadh (Saudi Arabia), Asian J. Chem. 13(2), 407–423.
4. Davis, A. P. Shokouhian, M., and Ni, S. B., 2001: Loading estimates of lead, copper, cadmium and zinc in urban runoff from specific sources, Chemosphere 44(5), 997–1009.
5. De Luca D’Alessandro, E., Guasticchi, G., and Zantedeschi, E., 1992: La presenza di piombo nell’ambiente ed effeti sulla salute umana, Inquinamento 34(6), 50–54.