A primer in Social Choice Theory, by Wulf Gaertner.
If you want more, have a look at:
Welfare Economics and Social Choice Theory by Allan Feldman and Roberto Serrano
To dig deeper:
Handbook of Social Choice and Welfare
By A. Sen, Kotaro Suzumura
Handbook of Social Choice and Voting by Jac C. Heckelman, Nicholas R. Miller
Handbook of ...
Beyond Michel De Vroey's book, I know of no other book on the history of macroeconomics, as it is praised by macroeconomists. See for example this review.
De Vroey has a true vision of macroeconomics, he shares it with his reader and gives clear guidelines to understand the developments in the field.
Anyway, you will find below some nice references that ...
All four of those books are widely used at the undergraduate level. They are written with the intention to be text-books of a class, so they should be good for self-study. I recommend you to read 1 and 2 before reading 3 and 4.
Will give you a basic overview of the way we think in economics, clarify some basic concepts and explain work-horse models in the ...
Nothing will be better than going through the textbook. Lecture's slides can be beneficial, you can google newer versions or access older here: http://www.mtholyoke.edu/~mirobins/econ212.html. I also used notes done by Łukasz Woźny, from SGH: http://web.sgh.waw.pl/lwozny/LectureNotes.pdf - they are not entirely based on Varian's textbook but might be helpful ...