Introduction to reference work, Vol.1 Basic information sources /

Eitemau Tebyg

• Introduction to reference work, Vol.2 Reference services and reference processes /
  gan: Katz, William A.
  Cyhoeddwyd: (1992)
• Introduction to reference work. 2v : Basic information sources /
  gan: Katz, William A.
  Cyhoeddwyd: (1992)
• Introduction to reference work. 2v : Basic information sources /
  gan: Katz, William A.
  Cyhoeddwyd: (1969)
• Introduction to reference work. 2v : Basic information sources /
  gan: Katz, William A.
  Cyhoeddwyd: (1969)
• Introduction to reference work. 2v : Basic information sources /
  gan: Katz, William A.
  Cyhoeddwyd: (1969)