Juana has given the correct response. To explain further - the links given to an external site should be such that they are not promotional in nature (known as spamming). Thus, for example, if I write an article on how to sell a product at a reputed e-commerce site, I can give a link to its policy page, but cannot give a link to any product page. You must also ensure that external links are to reputed sites. For example, I can give links to universities, schools and colleges, but not to a tuition class.
It is also a good idea to give internal links as it will keep the readers within the pages of ISC. Thus, in a college admissions article I would give a link to the college page.of ISC and could give the external link to the college website at the end, where the contact details are mentioned.
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