add references to intro cpp

Author: tolstenko

advanced/README.md

@@ -18,7 +18,7 @@ Holidays:
 | Week 6 2023/10/02  | Operator overloading, type conversion operators, convert constructors, aggregation and composition, namespaces                                                 |
 | Week 7 2023/10/09  | Mid term / break                                                                                                                                               |
 | Week 8 2023/10/16  | Vectors and arrays of objects. Linked lists, linked list operations                                                                                            |
-| Week 9 2023/10/23  | Thanksgiving Break - No Class on Friday) Inheritance, protected members, constructors/destructors                                                              |
+| Week 9 2023/10/23  | Thanksgiving Break - No Class on Friday Inheritance, protected members, constructors/destructors                                                               |
 | Week 10 2023/10/30 | inheritance, overriding base class functions                                                                                                                   |
 | Week 11 2023/11/06 | Inheritance hierarchies, polymorphism and virtual member functions, abstract base classes and pure virtual functions                                           |
 | Week 12 2023/11/13 | Exceptions, function and class templates, STL and STL containers, iterators                                                                                    |

intro/README.md

@@ -21,3 +21,15 @@
 | 15   | 2023/04/24 | Review                                                                       |
 | 16   | 2023/05/01 | FINALS                                                                       |
 
+# References
+
+- [learncpp](https://www.learncpp.com/)
+- [cpluslus](https://cplusplus.com/doc/tutorial/)
+- [cprogramming](https://www.cprogramming.com/tutorial/c++-tutorial.html)
+- [programming-books](https://www.programming-books.io/essential/cpp/)
+- [google style guide](https://google.github.io/styleguide/cppguide.html)
+- [riptutorial](https://riptutorial.com/cplusplus)
+- [cpp manual](https://cppreference.com/)
+- [cpp core guidelines](https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines)
+- [rooksguide](https://rooksguide.files.wordpress.com/2013/12/rooks-guide-isbn-version.pdf)
+- [cpp best practices](https://lefticus.gitbooks.io/cpp-best-practices/content/)