Cita APA (7a ed.)

(1971). Helping others could be fun (Experimental ed.). Educational Publ. Bureau.

Cita Chicago Style (17a ed.)

Helping Others Could Be Fun. Experimental ed. Singapore: Educational Publ. Bureau, 1971.

Cita MLA (9a ed.)

Helping Others Could Be Fun. Experimental ed. Educational Publ. Bureau, 1971.