Dua, R. (1970). A textbook of advanced eco. theory. Loyal Bk. Depot.
Chicago-čujuhus (17. p.)Dua, R. A Textbook of Advanced Eco. Theory. Meerut: Loyal Bk. Depot, 1970.
MLA-čujuhus (9. p.)Dua, R. A Textbook of Advanced Eco. Theory. Loyal Bk. Depot, 1970.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.