Dyfyniad APA

(1969). Communities: Student manual (Trial ed.). Science Curriculum Improvement Study.

Dyfyniad Arddull Chicago

Communities: Student Manual. Trial ed. Berkeley, CA: Science Curriculum Improvement Study, 1969.

Dyfyniad MLA

Communities: Student Manual. Trial ed. Science Curriculum Improvement Study, 1969.

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