Statistical abstract of education, science and culture 1979 / 
Research and Statistics Division. 
 - Tokio :  Ministry of Education, Science and Culture,  1979. 
 - 217 p. :  fot. 
<br/><br/><label>No. de Clasificación Universal Decimal: </label>OC 31:37 (520) "1979" =20 STA.