APA način citiranja

Cohn, L. H., Collins, J. J., DiSesa, V. J., Couper, G. S., Peigh, P. S., Kowalker, W., & Allred, E. (1989). Fifteen-year experience with 1678 Hancock porcine bioprosthetic heart valve replacements.

Čikaški stil citiranja

Cohn, L H., J J. Collins, V J. DiSesa, G S. Couper, P S. Peigh, W. Kowalker, i E. Allred. Fifteen-year Experience With 1678 Hancock Porcine Bioprosthetic Heart Valve Replacements. 1989.

MLA način citiranja

Cohn, L H., et al. Fifteen-year Experience With 1678 Hancock Porcine Bioprosthetic Heart Valve Replacements. 1989.