A treatise is a scholarly commentary on the law usually written by a law professor or lawyer, often on the editorial staff of the publisher. It contains comments, citations to cases and other sources of the law, and internal finding aids like an index.
A hornbook is a textbook containing the basics of a given area of law. When you are looking for the fundamental concepts of a well settled area of law a hornbook can help.
Nutshells are concise and comprehensive guides to various areas of law as well as practical guides to skills such as trial and clinical skills for students and lawyers.
Real Property in a Nutshell by 
Personal Property in a Nutshell by 
The Law of Property by 
The Law of Real Estate Financing by 
