机读格式显示(MARC)

• 000 00630nam a2200217 a 4500

• 001 0000838310

• 005 20250906092000.0

• 008 931112s1993 enk 000 0 eng d

• 010 __ |a 93230530

• 020 __ |a 0415089425

• 040 __ |a DLC |c DLC

• 090 __ |a G424/X2

• 093 __ |a G424

• 099 __ |a CAL 022000434701

• 245 00 |a Theoretical principal of distance education / |c edited by Desmond Keegan.

• 260 __ |a London ; |a New York : |b Routledge, |c 1993.

• 300 __ |a xiii, 272 p. ; |c 22 cm.

• 650 _0 |a Educational technology.

• 650 _0 |a Education |x Aims and objectives.

• 650 _0 |a Distance education.

• 700 1_ |a Keegan, Desmond.