elsharkawy, a. i. (1990). Renewable energy sources.
Chicago-čujuhus (17. p.)elsharkawy, abdullatif i. Renewable Energy Sources. cairo, 1990.
MLA-čujuhus (9. p.)elsharkawy, abdullatif i. Renewable Energy Sources. 1990.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.