{% for book in site.data.books-read %} {% if book.year_read == include.year %} {% if book.isbn == "None" %} * [{{ book.title }}]({{ book.link }}) by {{ book.author }} (ISBN unknown) {% else %} * [{{ book.title }}]({{ book.link }}) by {{ book.author }} (ISBN: {{ book.isbn }}) {% endif %} {% endif %} {% endfor %}