Yes History Teaching Reference for Middle School is bimonthly, and there is no difference between the first half and the second half. All of them are collected by HowNet, and the page fee is not much, and there are many contributors, which leads to a long submission and publication cycle of this periodical, usually about one year. Publication fee refers to the fee charged by periodical editors to authors who publish papers in regular academic journals approved by the State Press and Publication Administration.