SIGHAL B L. MECHANICAL UTILITY SYSTEMS.
Chicago-čujuhus (17. p.)SIGHAL B L. MECHANICAL UTILITY SYSTEMS.
MLA-čujuhus (9. p.)SIGHAL B L. MECHANICAL UTILITY SYSTEMS.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.
APA-čujuhus (7. p.)