"Use reference books, also called reference or background sources, to get quick specific facts or information or an overview of a subject...Some examples of reference sources are: dictionaries, encyclopedias, bibliographies, almanacs, directories, atlases, and handbooks. These can be online or in print" ["What are reference books (or reference sources)?", Simon Fraser University Library].
Reference sources can also point to scholarly sources in their list of references or suggested resources for further reading.
CultureGrams™ is a primary source reference for concise, reliable, and up-to-date cultural information on the countries of the world. CultureGrams provides an insider's perspective on daily life and culture, including the history, customs, and lifestyles of the world's people.
Provides critical country-specific intelligence and data through its suite of products to over 4000 clients including public and private sector organizations with overseas operations and global interests.
The Global Road Warrior covers 175 countries. Key facts people, economy, work week, holidays, money, foreign exchange, visas, climate, passports, immunization, entry and departure, emergencies, internal travel information, country map
Encyclopedia of Holidays and Celebrations 3 Volume Set by 
Worldmark Encyclopedia of Cultures and Daily Life by 
Celebrating Life Customs Around the World by Encyclopedia of Holidays and Celebrations 3 Volume Set by 
Religious Holidays and Calendars by 
Countries, Peoples and Cultures (Complete Nine Volume Set) by