TY  - BOOK
@foreach($document->creators as $creator)
AU  - {{$creator->type === 1? $creator->given . ' ' . $creator->family: $creator->literal}}
@endforeach
@if($document->fieldValue('abstract'))
AB  - {{$document->fieldValue('abstract')}}
@endif
@if($document->fieldValue('issued'))
Y1  - {{$document->fieldValue('issued')}}
@endif
@if($document->title)
TI  - {{$document->title}}
@endif
@if($document->language)
LA  - {{$document->language}}
@endif
ER  -