Gray William S., Monroe Marion, Arley A. Sterl, & Arbuthnot May Hill. (1955). The new people and progress. Chicago: Scott, Foresman and Company.
Dyfyniad Arddull ChicagoGray William S., Monroe Marion, Arley A. Sterl, và Arbuthnot May Hill. The New People and Progress. Chicago: Scott, Foresman and Company, 1955.
Dyfyniad MLAGray William S., Monroe Marion, Arley A. Sterl, và Arbuthnot May Hill. The New People and Progress. Chicago: Scott, Foresman and Company, 1955.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.