Gilbertson, H. W. (1948). Educational exhibits: How to prepare and use them; a manual for extension workers. U.S. Govt. Print. Off..
Dyfyniad Arddull ChicagoGilbertson, Henry Walter. Educational Exhibits: How to Prepare and Use Them; a Manual for Extension Workers. Washington: U.S. Govt. Print. Off., 1948.
Dyfyniad MLAGilbertson, Henry Walter. Educational Exhibits: How to Prepare and Use Them; a Manual for Extension Workers. U.S. Govt. Print. Off., 1948.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.