APA
Grace H. W, . (1971). A handbook on patents. Charles knight & Co. Ltd, London: .
Chicago
Grace H. W, . 1971. A handbook on patents. Charles knight & Co. Ltd, London: .
Harvard
Grace H. W, . (1971). A handbook on patents. Charles knight & Co. Ltd, London: .
MLA
Grace H. W, . A handbook on patents. Charles knight & Co. Ltd, London: . 1971.