If you are starting out to learn Russian and looking for a textbook, here is a list of textbooks that are available to view and download. Once you click on the textbook, you should be redirected to Dropbox. If you are experiencing technical issues, please, get in touch, and I will troubleshoot.
Colloquial Russian: The Complete Course For Beginners by Svetlana Le Fleming, Susan E. Kay (1997, Routledge)
This is a narrative style textbook that will take you through the journey of Mr Green who came to Moscow to work as a businessman. Every lesson is based on a story about Peter Green and the people that he meets during his stay in Russia. Bear in mind that the addition that is offered to view and download is from 1997, which means that the book includes outdated cultural references. Regardless, it is useful for anyone who learns Russian to know these cultural references, because any Russian will know them and it is better to be on the same page with locals.
Дорога в Россию: Учебник русского языка.
В. Е. Антонова, М. М. Нахабина, М. И. Сафронова, А. А. Толстых
This textbook is excellent, but probably not suitable for self-study (unless you know Mandarin). The book has pronunciation practice that gradually guides you through Russian sounds.
Русский язык как иностранный: Учебник для иностранных студентов первого курса.
Лебединский С. И., Гончар Г. Г.
This textbook is designed for foreign students who study Russian in a university, therefore it is also best to work through this book with a teacher. The book has a sound communicative strategy. The level of the book varies a lot from page to page, so you might find material suitable for A1 student as well as for B2 student. If you are a curious learner, who likes the challenge, then go for it!