C++ coding standards : 101 rules, guidelines, and best practices / Herb Sutter, Andrei Alexandrescu. Addison-Wesley, 2005
Such a simple yet invaluable book to anyone coding in C++, because code readability is so important. Lend it to co-workers and hope they read it.
The recommended standards are practical, and after you have read this book you will see them as common-sense. Each is supported by references to well known authorities.