SRMO is your "go to" resource.
It is a specialized search engine & full text database for all methodology content from Sage Publishers, including Sage ebooks, journals, encyclopedias, dictionaries, and videos. In addition, here also is Sage's well regarded Little Green Book series [quantitative] and the Little Blue Book series [qualitative].
Within SRMO you will be able to search, discover, and download chapters, articles, etc. If you set up a personal account within SRMO, you will be able to create public and private lists [bookshelves] of selected content.
Within SRMO there are also community of practice blogs etc. around methodology topics.