Dyfyniad APA
De Grijs, R. (2011). An introduction to distance measurement in astronomy. John Wiley & Sons.
Dyfyniad Arddull Chicago
De Grijs, Richard. An Introduction to Distance Measurement in Astronomy. Chichester, West Sussex ; Hoboken, N.J.: John Wiley & Sons, 2011.
Dyfyniad MLA
De Grijs, Richard. An Introduction to Distance Measurement in Astronomy. John Wiley & Sons, 2011.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.