Smol Gaby & Chapman David. (1999). Block 3 systems and processes: Message coding. The Open University.
Chicago Style (17th ed.) CitationSmol Gaby and Chapman David. Block 3 Systems and Processes: Message Coding. The Open University, 1999.
MLA (8th ed.) CitationSmol Gaby and Chapman David. Block 3 Systems and Processes: Message Coding. The Open University, 1999.
Warning: These citations may not always be 100% accurate.