Gilbertson, H. W. (1948). Educational exhibits: How to prepare and use them; a manual for extension workers. U.S. Govt. Print. Off..
Lua i Stíl Chicago (17ú heag.)Gilbertson, Henry Walter. Educational Exhibits: How to Prepare and Use Them; a Manual for Extension Workers. Washington: U.S. Govt. Print. Off., 1948.
Lua MLA (8ú heag.)Gilbertson, Henry Walter. Educational Exhibits: How to Prepare and Use Them; a Manual for Extension Workers. U.S. Govt. Print. Off., 1948.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.