Cita APA

Howard, S., Wan, S., & Freeman, L. J. (2007). Congenital absence of the pulmonary valve. BMJ Group.

Chicago Style Citation

Howard, S., S. Wan, i L J. Freeman. Congenital Absence of the Pulmonary Valve. BMJ Group, 2007.

Cita MLA

Howard, S., S. Wan, i L J. Freeman. Congenital Absence of the Pulmonary Valve. BMJ Group, 2007.