Social Science discussion

I think all people have a book which always pop up when are thinking or working around a social science idea. It does not matter the topic, in some way the first thinking are linked with it. Actually and the most funny thing is that the book works in your ordinary life: you quote the book (author), express and explain the ideas to explain yourself behavior and always you want to go back to the book because you really think that there are all the society answers.
So, which is this book?

I have two magic social science books. First, Economic and Society by Weber, I do not know if is because its a compendium of Weber' documents but you can find anything in this book, since economy, power, rationalism to religion.
On the other hand, The Elementary Forms of the Religious life by Durkheim; I think the modern sociology is based on Durkheim' construction.