por Langley, Andrew [autor] | Mortelmans, Edward [ilustrador] | Cárdenas, Felipe [traductor] | Langley, Andrew. Twenty explorers.
por Blackwood, Alan, 1932- [autor] | Mortelmans, Edward [ilustrador] | Cárdenas, Felipe [traductor] | Blackwood, Alan, 1932-. Twenty names in art.
por Hunter, Nigel [autor] | Mortelmans, Edward [ilustrador] | Cárdenas, Felipe [traductor] | Hunter, Nigel. Twenty campaigners for change.