APA

(1991). Boletín. Hato Rey, P.R: National Association of Social Workers, Inc. Puerto Rico Chapter.

Chicago

1991. Boletín. Hato Rey, P.R: National Association of Social Workers, Inc. Puerto Rico Chapter.

Harvard

(1991). Boletín. Hato Rey, P.R: National Association of Social Workers, Inc. Puerto Rico Chapter.

MLA

Boletín. Hato Rey, P.R: National Association of Social Workers, Inc. Puerto Rico Chapter. 1991.