Dyfyniad APA

Friedman. Human Spaceflight. University of Arizona Press.

Dyfyniad Arddull Chicago

Friedman. Human Spaceflight. University of Arizona Press.

Dyfyniad MLA

Friedman. Human Spaceflight. University of Arizona Press.

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