Rivera Sheila. (2008). First Step Non Fiction Forest. Lerner.
Chicago-čujuhus (17. p.)Rivera Sheila. First Step Non Fiction Forest. UK: Lerner, 2008.
MLA-čujuhus (9. p.)Rivera Sheila. First Step Non Fiction Forest. Lerner, 2008.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.