TY - BOOK ID - 127697128 TI - Social systems and learning systems. AU - Hanken, Albert F. G. AU - Reuver, H. A. PY - 1981 SN - 0898380502 PB - Boston (Mass.) : Nijhoff, DB - UniCat KW - Instructional systems. KW - Social systems. KW - System theory. UR - https://www.unicat.be/uniCat?func=search&query=sysid:127697128 AB - ER -