APA (7th ed.) Citation

Felix, S. M., Ferreira, J. S., Martins, P. B., Branco, M. J., & Soares, C. S. (1981). Alterations of surface electrocardiogram in 35 patients during upper fiberendoscopy.

Chicago Style (17th ed.) Citation

Felix, Sérgio M., Jorge S. Ferreira, Pedro B. Martins, Maria J. Branco, and Carlos S. Soares. Alterations of Surface Electrocardiogram in 35 Patients During Upper Fiberendoscopy. 1981.

MLA (9th ed.) Citation

Felix, Sérgio M., et al. Alterations of Surface Electrocardiogram in 35 Patients During Upper Fiberendoscopy. 1981.