Hughes, C. P. The Ordovician trilobite faunas of the Builth-Llandrindod inlier, central Wales. British Museum (Natural History).
Chicago Style (17th ed.) CitationHughes, C. P. The Ordovician Trilobite Faunas of the Builth-Llandrindod Inlier, Central Wales. London: British Museum (Natural History).
MLA (9th ed.) CitationHughes, C. P. The Ordovician Trilobite Faunas of the Builth-Llandrindod Inlier, Central Wales. British Museum (Natural History).
Warning: These citations may not always be 100% accurate.