Vogel,Klaus. (2005). Klaus Vagelon Double Taxation Conventions (ed.3.). Wolters Kluwer.
Dyfyniad Arddull ChicagoVogel,Klaus. Klaus Vagelon Double Taxation Conventions. ed.3. New Delhi: Wolters Kluwer, 2005.
Dyfyniad MLAVogel,Klaus. Klaus Vagelon Double Taxation Conventions. ed.3. Wolters Kluwer, 2005.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.