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Dyfyniad Arddull ChicagoWilliam Strahan (Firm), Strahan Archive (British Library), British Library, and British Library. The Strahan Archive from the British Library, London. Reading, England ; Woodbridge, Conn.: Research Publications, 1989.
Dyfyniad MLAWilliam Strahan (Firm), et al. The Strahan Archive from the British Library, London. Research Publications, 1989.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.