1. Ryan T J (1991) Vasculitis. In: ‘Textbook of Dermatology’. Ed: Rook, Wilkinson & Ebling 5th edition. Publ: Blackwell Scientific Publications, Oxford pp 1893–1961
2. Ryan T J & Burnand K (1991) Venous and Arterial Disease In: ‘Textbook of Dermatology’. Ed: Rook, Wilkinson & Ebling 5th edition. Publ: Blackwell Scientific Publications, Oxford pp 1963–2013