Collingwood, B. J. (1925). The Roman Wall: A guide to tourists traversing the barrier of the lower Isthmus (8th ed.). Newcastle-England: Blair R..
Παραπομπή Chicago StyleCollingwood, Bruce J. The Roman Wall: A Guide to Tourists Traversing the Barrier of the Lower Isthmus. 8th ed. Newcastle-England: Blair R., 1925.
Παραπομπή MLACollingwood, Bruce J. The Roman Wall: A Guide to Tourists Traversing the Barrier of the Lower Isthmus. 8th ed. Newcastle-England: Blair R., 1925.
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