@book{irrigation+practice+and+engineering+vol+1+use+of+irrigation+water+and+irrigation+practice,
    author = {Etcheverry, Bernard Alfred i Harding, Sidney Twitchell},
    title = {Irrigation practice and engineering. Vol. 1, Use of irrigation water and irrigation practice},
    address = {New York i London},
    publisher = {McGraw-Hill Book Company},
    date = {1933}
}