App marketing without budget is a long term process. You will need to spend lots of time promoting your app constantly on social media like Youtube and Facebook, seo driving traffic to your site or apps. Here are a few good marketing books that will get you started and drive a lot traffic to your website or apps. If you already know how to drive traffic to your apps, you can also some app Monetization strategies.
This is a great app marketing book that will show you how to promote your apps and get tens of thousands of installs. Learn how to do app store optimization (ASO) for both Play Store and App Store.
This book is not really a marketing book, but it will shows you how to build an app that will market itself. It talks about inside stories about the billion dollar apps like Instagram, Whatsapp, Snapchat, Candy Crush and what kind of thinking is required to build a very successful app.
This book is more like a general book about creating apps. It will show you how you can start making apps and eventually make a living out of it.
The following books are more about driving traffic to your website rather than apps. However, the principle of driving traffic are really the same. Also, it is highly recommended that you have a dedicated website for your app because that will get you more traffic and installs in the long run.
Learn how to drive traffic to your site or app using social media, take advantage of news releases and using videos to drive targeted traffic. You will learn marketing skills that you can apply today.
This book is mainly about search engine optimization or SEO which is about driving traffic to your website using search engines. Learn how to write articles that will rank high in search engines and get tons of free traffic.
This is another great book on social media marketing. In today’s society, everybody around you is using some form of social media, be it Facebook, Instagram, Twitter, Snapchat and etc. It is important for you to drive traffic to your website or app using these free platforms.