From Secret of the Ages

Much of this is echoed in today's productivity press, yet this book was written many decades ago.
From Secret of the Ages by Robert Collier, a classic.   (You just have to ignore is constant use of "men" and "man.")
1. Know what you want
2. Analyze what you must do to get it.
3. Plan ahead
4. Do one thing at a time
5. Finish and send that thing on its way
6. Once started KEEP GOING
7. If meet with a tough problem, sleep on it.

More Productivity Hacks

I especially like the "Airplane Days."  I have also found that I really look forward to time in the air and at the airport.  I read magazines I wouldn't normally read, get a different perspective, and find myself to be more creative and able to plan.  That's not productive in the "work" sense of the word, but it is quite valuable.
From Business Insider, as usual.

10 Habits and Books to go with them

List of attributes and books