APA

Welsby Derek A, . (1982). The Roman military defence of the British provinces in its later phases. Oxford, England: B.A.R.

Chicago

Welsby Derek A, . 1982. The Roman military defence of the British provinces in its later phases. Oxford, England: B.A.R.

Harvard

Welsby Derek A, . (1982). The Roman military defence of the British provinces in its later phases. Oxford, England: B.A.R.

MLA

Welsby Derek A, . The Roman military defence of the British provinces in its later phases. Oxford, England: B.A.R. 1982.