Cita APA (7a ed.)

Hughes, C. P. (1979). The Ordovician trilobite faunas of the Builth-Llandrindod Inlier, central Wales. Part. 3. Zenodo.

Cita Chicago Style (17a ed.)

Hughes, Christopher Paul. The Ordovician Trilobite Faunas of the Builth-Llandrindod Inlier, Central Wales. Part. 3. Zenodo, 1979.

Cita MLA (9a ed.)

Hughes, Christopher Paul. The Ordovician Trilobite Faunas of the Builth-Llandrindod Inlier, Central Wales. Part. 3. Zenodo, 1979.