Dyfyniad APA

(1990). Edmund scientific: 1990 annual reference catalog for optics, science and education. New Jersey: Edmund Scientific.

Dyfyniad Arddull Chicago

Edmund Scientific: 1990 Annual Reference Catalog for Optics, Science and Education. New Jersey: Edmund Scientific, 1990.

Dyfyniad MLA

Edmund Scientific: 1990 Annual Reference Catalog for Optics, Science and Education. New Jersey: Edmund Scientific, 1990.

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