Year book covering the year 1968.

MLA

Year Book Covering the Year 1968. [New York]: Crowell-Collier educational corporation, 1968.

APA

(1968). Year book covering the year 1968. [New York]: Crowell-Collier educational corporation.

Chicago

Year Book Covering the Year 1968. [New York]: Crowell-Collier educational corporation, 1968.