Lewis, P. (1977). MAPS AND STATISTICS. Metbuen & Co Ltd.
Chicago-čujuhus (17. p.)Lewis, Peter. MAPS AND STATISTICS. UK: Metbuen & Co Ltd, 1977.
MLA-čujuhus (9. p.)Lewis, Peter. MAPS AND STATISTICS. Metbuen & Co Ltd, 1977.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.