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 ###COBOL
-* [COBOL Programming Fundamental](http://ibmtc.hust.edu.cn/zos-cobol/cobol/resource/COBOL_Programming_Fundamental.pdf) (PDF)
+* [COBOL Programming Fundamental](http://yusman.staff.gunadarma.ac.id/Downloads/files/33460/COBOL_Programming_Fundamental.pdf) (PDF)
 * [OpenCOBOL 1.1 - Programmer's Guide](http://opencobol.add1tocobol.com/OpenCOBOL%20Programmers%20Guide.pdf) (PDF)