If you are currently enrolled in a college, check your college's site for online resources that will point you to internship jobs. Should that not work for you, there are actual sites online that do nothing more than list internship jobs.
For instance, you can truly refine your investigation of intern jobs if you use some of the search engines provided by such sites. In this way, you can search for detailed keywords, job functions, industry, and locations, among the many specifics you may utilize.
You yourself probably have a fine network to use for an internship lead. For instance talk with your friends, acquaintances, parents, the parents of your friends, former employers, other family members, and even your teachers. Simply ask them for their contacts that they may have in your career field or your particular interest. Should the contact sound extremely interesting and appropriate, do not forget to ask them if you can use them as a reference!
Once you are interviewing for summer internship jobs do not ever assume that your college will offer you academic credit for such a job. Before accepting the employment, it is wise to see if the college will give you credit. You can ascertain this directly with the college, and you may find that you might need a faculty sponsor to get credit. Thus it may be your responsibility to find such a sponsor and work it out with your prospective employer. Of course, you will already have ascertained if there is any kind of compensation, a stipend or even a salary, attached to intern jobs with that particular company.
There are a number of non-profit summer internship programs available online, if you search for them. Often they include not only training in the field of interest, but arrange for you to room with others. At times, they even offer travel opportunities to other countries. Thus if you wish to learn a foreign language you may find that the college of your choice will also include academic credit for language as well as the chosen field.
Many future employers feel that working during a summer internship job will not only teach you good work ethics, but will enrich you in many other ways. For instance, you'll learn how to communicate with clients, learn good business procedures, learn to follow up on various subjects, and many feel that the most important thing you are apt to learn is working responsibly with a team. You may also learn troubleshooting procedures, as well as quality control.
Regardless of which field you choose, having a mentor in your chosen field will prove to be worth a wealth of experience for you.