الموضوعات: “...Zeitschrift. swd...”
Available in Education Source.

الموضوعات: “...Zeitschrift gnd...”
Full text available from Career & Technical Education Database: 01/01/1992 to 05/31/1996
Full text available from Education Database: 01/01/1992 to 05/31/1996
Full text available from Research Library: 01/01/1992 to 05/31/1996