A periodical is any publication that is issued periodically. These include:

• Journal - a scholarly refereed publication usually aimed at members of a professional organization

• Magazine - a publication usually containing advertising, sold by subscription or on a newsstand and aimed at the general public

• Newspapers - current news published daily, weekly, monthly or on some other cycle

• Conference proceedings - a record of papers or presentations given at a conference for members of a specific organization

• Newsletter - a short summary of current information about an organization and its members

---