I have looked for good written sources of how to develop academic writing, targeting both PhD students and myself. I found the following three books and I do recommend them. Many people in the world who speak English professionally are non-native, and proper academic writing is hard but also needed. To me, the following reading order was useful.
Lindsay, David: Scientific Writing = Thinking in Words
Glasman-Deal, Hilary: Science Research Writing For Non-native Speakers Of English
Alley, Michael: The Craft of, Scientific Writing