Dyfyniad APA
US Dep. of Labor. US Employment Service. (1936). Job descriptions for the construction industry. US Gov. Print. Off.
Dyfyniad Arddull Chicago
US Dep. of Labor. US Employment Service. Job Descriptions for the Construction Industry. Washington: US Gov. Print. Off, 1936.
Dyfyniad MLA
US Dep. of Labor. US Employment Service. Job Descriptions for the Construction Industry. US Gov. Print. Off, 1936.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.