Dyfyniad APA

Johnson, S. (2011). Where good ideas come from. Penguin books.

Dyfyniad Arddull Chicago

Johnson, Steven. Where Good Ideas Come from. London: Penguin books, 2011.

Dyfyniad MLA

Johnson, Steven. Where Good Ideas Come from. Penguin books, 2011.

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