Travail et congés scolaires. 

 - Genève,  Bureau international d'éducation,  1933. 
 - 134 p.  24 cm. 
 - Publications du Bureau international d'éducation,  no. 30 .
 - Publication (International Bureau of Education) ;  no. 30. .
<br/><br/><label>LCCN: </label>e  37000011  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Vacations.<br/>School attendance.
<br/><br/><label>LC Class. No.: </label>L10  / .I6952 no. 30