[Upon suggestion of the OP, I am pasting my earlier meta post here.]

For those with a background in mathematics, perhaps the following source would be of use:

Curtis C. McKnight (Ed.). (2000). Mathematics education research: A guide for the research mathematician. American Mathematical Soc.. Link.

A review of the book can be found on the MAA website here.

From this latter link:

In a nutshell, this book is a guide for reading and evaluating mathematics education research, especially undergraduate mathematics education research. Its purpose seems to be to encourage research mathematicians, who do much of the teaching of undergraduate mathematics, to use education research to actually inform their teaching. In order to use this research, though, mathematicians need to know how to find and evaluate the research already done, and this is the focus of this book.

There is plenty more to the review, and the book itself is quite readable. (Unfortunately, only part is available through the Google Books link provided above; please edit in a full link if you find one!)

For those with a background in mathematics, perhaps the following source would be of use:

Curtis C. McKnight (Ed.). (2000). Mathematics education research: A guide for the research mathematician. American Mathematical Soc.. Link.

A review of the book can be found on the MAA website here.

From this latter link:

In a nutshell, this book is a guide for reading and evaluating mathematics education research, especially undergraduate mathematics education research. Its purpose seems to be to encourage research mathematicians, who do much of the teaching of undergraduate mathematics, to use education research to actually inform their teaching. In order to use this research, though, mathematicians need to know how to find and evaluate the research already done, and this is the focus of this book.

There is plenty more to the review, and the book itself is quite readable. (Unfortunately, only part is available through the Google Books link provided above; please edit in a full link if you find one!)

I might add that the MAA has a page on Teaching and Learning. You could also search the site for education to find relevant links. For example, the second result is the "Searching for Common Ground" reference provided in a separate answer here from M Jansen.