APA
Williams G. F., . (1981). Children with chronic arthritis. Littleton: PSG Publishing.
Chicago
Williams Gordon F, . 1981. Children with chronic arthritis. Littleton: PSG Publishing.
Harvard
Williams G. F., . (1981). Children with chronic arthritis. Littleton: PSG Publishing.
MLA
Williams Gordon F, . Children with chronic arthritis. Littleton: PSG Publishing. 1981.