APA
Bortolotti, U. (1995). The problem of reoperation in bioprosthetic valve recipients. Journal of Heart Valve Disease, 1(1), 29-31.
MLA
Bortolotti, U. "The problem of reoperation in bioprosthetic valve recipients." Journal of Heart Valve Disease 1.1 (1995): 29-31.
Chicago
Bortolotti, U. "The problem of reoperation in bioprosthetic valve recipients." Journal of Heart Valve Disease 1, no. 1 (1995): 29-31.
Harvard
Bortolotti, U. (1995) 'The problem of reoperation in bioprosthetic valve recipients' Journal of Heart Valve Disease 1(1), pp. 29-31.
Vancouver
Bortolotti U. The problem of reoperation in bioprosthetic valve recipients. Journal of Heart Valve Disease. 1995 ;1(1):29-31.