Note that this resources is a bit of a cross-over in being a legal treatise and a practice guide. Available on Lexis. Search "Sources" for the title of the book.
Nutshells summarize the law on one topic in one small volume. Here the topics covered include history, constitutional basis, statutory structure, regulatory provisions, administrative procedure, and ethical principles related to immigration law and practice. Updated to reflect developments since the 2016 Presidential election.
Immigration Law and the Family by Sarah B. Ignatius et al.