IKPO, J. I. (2006). Building maintenance. Sedyn Publishers.
Chicago-čujuhus (17. p.)IKPO, Johnson Ime. Building Maintenance. Sedyn Publishers, 2006.
MLA-čujuhus (9. p.)IKPO, Johnson Ime. Building Maintenance. Sedyn Publishers, 2006.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.