My English isn't good, so I have always asked in Japanese, but Japanese isn't my mother tongue either. Sometimes, when I'm asking a question in Japanese, the question and the example are related to a textbook or a novel, so I have to show where the example comes from.
In this question, the example is from a Japanese novel which is Natsume Soseki's Kokoro.
How do I tell everybody this sentence is from a Natsume novel?
I've tried the following examples before but maybe they are unnatural in Japanese.
but this one must be correct:
Any other way to show a source in Japanese?