por Grant, David | Hughes, John [coautor] | Turner, Rebecca [coautor] | Alastair, Lane [interactive workbook material].
por Hughes, John | Naunton, Jon [coautor] | Alastair, Lane [interactive workbook material] | Speck, Chris [interactive workbook material].
por Duckworth, Michael | Turner, Rebecca [coautor] | Alastair, Lane [interactive workbook material].