Easter School in Agricultural Science (11th : University of Nottingham), Hallsworth, E. G., & Crawford, D. V. (1965). Experimental pedology: Proceedings of the Eleventh Easter School in Agricultural Science, University of Nottingham, 1964. Butterworths.
Lua i Stíl Chicago (17ú heag.)Easter School in Agricultural Science (11th : University of Nottingham), E. G. Hallsworth, agus D. V. Crawford. Experimental Pedology: Proceedings of the Eleventh Easter School in Agricultural Science, University of Nottingham, 1964. London: Butterworths, 1965.
Lua MLA (9ú heag.)Easter School in Agricultural Science (11th : University of Nottingham), et al. Experimental Pedology: Proceedings of the Eleventh Easter School in Agricultural Science, University of Nottingham, 1964. Butterworths, 1965.