APA (7th ed.) Citation

Welch, F. B. A., & Trotter, F. M. (1961). Geology of the country around Monmouth and Chepstow: (explanation of sheets 233 and 250). H.M. Stationery Off.

Chicago Style (17th ed.) Citation

Welch, F. B. A., and F. M. Trotter. Geology of the Country Around Monmouth and Chepstow: (explanation of Sheets 233 and 250). London: H.M. Stationery Off, 1961.

MLA (8th ed.) Citation

Welch, F. B. A., and F. M. Trotter. Geology of the Country Around Monmouth and Chepstow: (explanation of Sheets 233 and 250). H.M. Stationery Off, 1961.