Cita APA

Sierra Ramos, R., Ohshima, H., Muñoz Calero, N., Teuchmann, S., Peña, S., Malaveille, C., . . . Bartsch, H. (1991). Exposure to N-nitrosamines and other risk factors for gastric cancer in Costa Rican children.

Citación estilo Chicago

Sierra Ramos, Rafaela, et al. Exposure to N-nitrosamines and Other Risk Factors for Gastric Cancer in Costa Rican Children. 1991.

Cita MLA

Sierra Ramos, Rafaela, et al. Exposure to N-nitrosamines and Other Risk Factors for Gastric Cancer in Costa Rican Children. 1991.