Bert, .
New ways to Better Meetings / Textual Documents Bert. - Newyork : The Viklny press , 1960. - 177 ; .
658.456 / BER/NE
New ways to Better Meetings / Textual Documents Bert. - Newyork : The Viklny press , 1960. - 177 ; .
658.456 / BER/NE