APA

Pineda M. A., Araya J. D., Bertrand J. T., Suazo M., Bixby L. R., Cuervo L. I., Espino E. E., Infante C., Grijalva A. R. & Liriano R. L. (19870814). [Frequency of coitus and calculation of the number of months of protection by couple in 8 Latin American countries]. : Boletin de la Oficina Sanitaria Panamericana. Pan American Sanitary Bureau.

Chicago

Pineda M A, Araya J D, Bertrand J T, Suazo M, Bixby L R, Cuervo L I, Espino E E, Infante C, Grijalva A R and Liriano R L. 19870814. [Frequency of coitus and calculation of the number of months of protection by couple in 8 Latin American countries]. : Boletin de la Oficina Sanitaria Panamericana. Pan American Sanitary Bureau.

Harvard

Pineda M. A., Araya J. D., Bertrand J. T., Suazo M., Bixby L. R., Cuervo L. I., Espino E. E., Infante C., Grijalva A. R. and Liriano R. L. (19870814). [Frequency of coitus and calculation of the number of months of protection by couple in 8 Latin American countries]. : Boletin de la Oficina Sanitaria Panamericana. Pan American Sanitary Bureau.

MLA

Pineda M A, Araya J D, Bertrand J T, Suazo M, Bixby L R, Cuervo L I, Espino E E, Infante C, Grijalva A R and Liriano R L. [Frequency of coitus and calculation of the number of months of protection by couple in 8 Latin American countries]. : Boletin de la Oficina Sanitaria Panamericana. Pan American Sanitary Bureau. 19870814.