Brecon Beacons National Park. (1993). Cynllun Parc Cenedlaethol Bannau Brycheiniog : trydydd argraffiad 1993-98 = Brecon Beacons National Park plan : 1993-98: Trydydd argraffiad 1993-98 = Brecon Beacons National Park plan : 1993-98 (3rd ed.). Parc Cenedlaethol Bannau Brycheiniog.
Chicago Style (17th ed.) CitationBrecon Beacons National Park. Cynllun Parc Cenedlaethol Bannau Brycheiniog : Trydydd Argraffiad 1993-98 = Brecon Beacons National Park Plan : 1993-98: Trydydd Argraffiad 1993-98 = Brecon Beacons National Park Plan : 1993-98. 3rd ed. Aberhonddu: Parc Cenedlaethol Bannau Brycheiniog, 1993.
MLA (9th ed.) CitationBrecon Beacons National Park. Cynllun Parc Cenedlaethol Bannau Brycheiniog : Trydydd Argraffiad 1993-98 = Brecon Beacons National Park Plan : 1993-98: Trydydd Argraffiad 1993-98 = Brecon Beacons National Park Plan : 1993-98. 3rd ed. Parc Cenedlaethol Bannau Brycheiniog, 1993.