- 《글로벌 세계대백과사전》, 〈제4차산업〉
- Tor Selstad (1990). “The rise of the quaternary sector. The regional dimension of knowledge-based services in Norway, 1970-1985”. informaworld. 2010년 6월 17일에 확인함.
... knowledge-based services ...
- Peter Busch (1967). “Tacit Knowledge in Organizational Learning”. Tacit Knowledge in Organizational Learning. 2010년 6월 17일에 확인함.
see page .. The quaternary sector of industry is the sector of industry that involves the intellectual services. That is research, development, and information.
- “What are some example of jobs in the Quaternary Industry?”. Yahoo! Answers. 2010년 6월 17일. 2010년 6월 17일에 확인함.
The quaternary sector consists of those industries providing information services, such as computing and ICT or information and communication technologies, consultancy, such as offering advice to businesses and research and development (R&D) in scientific fields. The quaternary sector can be seen as the sector in which companies invest in order to ensure further expansion. Some examples could be: background investigators, financial planners or consultants, real estate appraisers, information technology consultants who can set-up a computer network for your business and market research consultants who determine if a product in development will sell and make a profit.
- “ICTs, industry and the new teacher model”. Asian Correspondent. 2010년 6월 17일. 2012년 7월 30일에 원본 문서에서 보존된 문서. 2010년 6월 17일에 확인함.
In Australia, the service sector accounts for 70 per cent of the country’s economic activity. Within the service sector, however, more intellectual activities such as government, education, culture and media, can be further defined as the ‘quaternary’ sector of economy. These activities are typically not measured in monetary value but they significantly contribute to the economy.
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