Official Pimsleur subscriptions or CD sets can be expensive for students on a budget.
For insights into the Pimsleur method and Russian language learning materials available on the Internet Archive, the most relevant "paper" is the work of Dr. Paul Pimsleur pimsleur russian internet archive
For those using these archives, the Pimsleur Method remains one of the most respected audio-based systems for developing conversational Russian. Pimsleur Method: What Is It & Does It Work? Official Pimsleur subscriptions or CD sets can be