Dyfyniad APA

Newcomb, S. (1880). Popular astronomy (School ed.). Harper & Brothers.

Dyfyniad Arddull Chicago

Newcomb, Simon. Popular Astronomy. School ed. New York: Harper & Brothers, 1880.

Dyfyniad MLA

Newcomb, Simon. Popular Astronomy. School ed. Harper & Brothers, 1880.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.