APA (7th ed.) Citation

Roberts, J. (1788). Yr athrofa rad: ... O gasgliad, a myfyriad John Roberts. [publisher not identified].

Chicago Style (17th ed.) Citation

Roberts, John. Yr Athrofa Rad: ... O Gasgliad, a Myfyriad John Roberts. [Dublin]: [publisher not identified], 1788.

MLA (9th ed.) Citation

Roberts, John. Yr Athrofa Rad: ... O Gasgliad, a Myfyriad John Roberts. [publisher not identified], 1788.