Ramos, D. E. (1998). Walnut production manual. University of California.
Chicago-čujuhus (17. p.)Ramos, David E. Walnut Production Manual. Berkeley: University of California, 1998.
MLA-čujuhus (9. p.)Ramos, David E. Walnut Production Manual. University of California, 1998.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.