APA-čujuhus (7. p.)

Nuhu Issaka, R. (2012). Soil Fertility. IntechOpen.

Chicago-čujuhus (17. p.)

Nuhu Issaka, Roland. Soil Fertility. IntechOpen, 2012.

MLA-čujuhus (9. p.)

Nuhu Issaka, Roland. Soil Fertility. IntechOpen, 2012.

Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.