APA

Boszormenyi-Nagy I., Spark G. M., . (1973). Invisible loyalties: reciprocity in intergenerational family therapy. Hagerstown, Md: Medical Dept., Harper & Row.

Chicago

Boszormenyi-Nagy Ivan, Spark Geraldine M, . 1973. Invisible loyalties: reciprocity in intergenerational family therapy. Hagerstown, Md: Medical Dept., Harper & Row.

Harvard

Boszormenyi-Nagy I., Spark G. M., . (1973). Invisible loyalties: reciprocity in intergenerational family therapy. Hagerstown, Md: Medical Dept., Harper & Row.

MLA

Boszormenyi-Nagy Ivan, Spark Geraldine M, . Invisible loyalties: reciprocity in intergenerational family therapy. Hagerstown, Md: Medical Dept., Harper & Row. 1973.