Also there is a book by Deitmar and Echterhoff - "Principles of Harmonic Analysis", which I found quite readable, but that threats treats coefficients in $\mathbb{R}$ only. But this book is probably more likely to be useful for graduate students.
Also there is a book by Deitmar and Echterhoff - "Principles of Harmonic Analysis", which I found quite readable, but that threats coefficients in $\mathbb{R}$ only. But this book is probably more likely to be useful for graduate students.