Dyfyniad APA

Victor, E., & Kellough, R. D. (1997). Science for the elementary and middle school (8th ed.). Merrill.

Dyfyniad Arddull Chicago

Victor, Edward, and Richard D. Kellough. Science for the Elementary and Middle School. 8th ed. Upper Saddle River, N.J: Merrill, 1997.

Dyfyniad MLA

Victor, Edward, and Richard D. Kellough. Science for the Elementary and Middle School. 8th ed. Merrill, 1997.

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