Authors:
{% assign authorCount = page.authors | size %}
{% if authorCount == 0 %}
No author
{% elsif authorCount == 1 %}
{{ page.authors | first }}
{% else %}
{% for author in page.authors %}
{% if forloop.first %}
{{ author }}
{% elsif forloop.last %}
and {{ author }}
{% else %}
, {{ author }}
{% endif %}
{% endfor %}
{% endif %}