# References The following list of books & PDFs are recommended reads if you want to understand the project future direction. We use these books as baseline shared language to discuss our architectural decisions and plans. * [OMG BPMN 2.x Spec](https://www.omg.org/spec/BPMN/) * [Cloud Native Java](https://www.amazon.co.uk/Cloud-Native-Java-Designing-Resilient/dp/1449374646/ref=sr_1_1?ie=UTF8\&qid=1531487284\&sr=8-1\&keywords=cloud+native+java) * [Building Microservices](https://www.amazon.co.uk/Building-Microservices-Designing-Fine-Grained-Systems/dp/1492034029/ref=sr_1_3?s=books\&ie=UTF8\&qid=1531487341\&sr=1-3\&keywords=building+microservices) * [Implementing Domain Driven Designs](https://www.amazon.co.uk/Implementing-Domain-Driven-Design-Vaughn-Vernon/dp/0321834577/ref=sr_1_2?s=books\&ie=UTF8\&qid=1531487429\&sr=1-2\&keywords=domain+driven+design) * [BPMN method and style](https://www.amazon.co.uk/Bpmn-Method-Style-Implementers-Guide/dp/0982368119/ref=sr_1_1?ie=UTF8\&qid=1531487366\&sr=8-1\&keywords=bpmn+method+and+style) * [12 factor apps](http://12factor.net) * [Beyond the 12 factor app](https://content.pivotal.io/blog/beyond-the-twelve-factor-app) * [Kubernetes in Action](https://www.amazon.co.uk/Kubernetes-Action-Marko-Luksa/dp/1617293725/ref=sr_1_1?s=books\&ie=UTF8\&qid=1531487409\&sr=1-1\&keywords=kubernetes+in+action) --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://activiti.gitbook.io/activiti-7-developers-guide/overview/references.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.