Howlett, D. (1967). A geography of Papua and New Guinea. Nelson.
Chicago-čujuhus (17. p.)Howlett, D.R. A Geography of Papua and New Guinea. Sydney: Nelson, 1967.
MLA-čujuhus (9. p.)Howlett, D.R. A Geography of Papua and New Guinea. Nelson, 1967.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.