APA

Schultheis M. J. y. O., . (1987). Our best kept secret. Washington: Center of Concern.

Chicago

Schultheis M J y Otros, . 1987. Our best kept secret. Washington: Center of Concern.

Harvard

Schultheis M. J. y. O., . (1987). Our best kept secret. Washington: Center of Concern.

MLA

Schultheis M J y Otros, . Our best kept secret. Washington: Center of Concern. 1987.