APA način citiranja

Gullace, G., Savoia, M. T., Ravizza, P., Locatelli, V., Addamiano, P., & Ranzi, C. (1981). Contrast echocardiographic features of pulmonary hypertension and regurgitation.

Čikaški stil citiranja

Gullace, G., M T. Savoia, P. Ravizza, V. Locatelli, P. Addamiano, i C. Ranzi. Contrast Echocardiographic Features of Pulmonary Hypertension and Regurgitation. 1981.

MLA način citiranja

Gullace, G., et al. Contrast Echocardiographic Features of Pulmonary Hypertension and Regurgitation. 1981.