I have 5 years of testing experience in top MNCs. I can prepare you the article on all the four topics which you mentioned. I am from Chennai.
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1) Test Plan - I will be covering what are all the things that needs to be place in test plan i.e., Test Plan Objectives, Scope of Testing, Test Strategy, Environment Requirements, Test Schedule, Functions To Be Tested etc., and brief description on all the points
2) Integration Testing - brief description on integration testing with a diagram, different approaches in integration testing, Etc.,
3) white box testing - What is White box testing, Difference between white box and black box, who will be responsible for white box testing, concepts like code coverage, branch coverage etc., will be explained.
4) System Testing - What is system testing, what all the thing will be covered in system testing, small notes on functionality test and non functionality test that will be conducted at system level etc.,
Looking for you response.
Thanks