Seiliwyd ar yr ail arg. o'r gwaith Saesneg gwreiddiol = Based on 2nd ed. of original English work: [London]: Macdonald & Evans, 1985.
Cynhyrchwyd a chyfieithwyd gan = Produced and translated by: Coleg Technegol Gwynedd.
Twristiaeth by J. Christopher Holloway. ISBN 1871913152. Published by Canolfan Astudiaethau Iaith in 1990. Publication and catalogue information, links to buy online and reader comments.