<s>
Bookends	B-Application
is	O
a	O
commercial	O
reference	B-Application
management	I-Application
software	I-Application
package	O
for	O
macOS	B-Application
that	O
is	O
used	O
to	O
manage	O
bibliographies	O
and	O
references	O
when	O
writing	O
essays	O
and	O
articles	O
.	O
</s>
<s>
It	O
works	O
with	O
several	O
word	B-General_Concept
processors	I-General_Concept
,	O
including	O
Microsoft	B-Application
Word	I-Application
,	O
Apple	B-Application
Pages	I-Application
,	O
Mellel	B-Operating_System
,	O
Nisus	B-Operating_System
Writer	I-Operating_System
Express	I-Operating_System
,	O
OpenOffice.org	B-Application
Writer	I-Application
,	O
Scrivener	B-Application
(	O
software	O
)	O
and	O
others	O
.	O
</s>
<s>
Bookends	B-Application
is	O
made	O
by	O
Sonny	O
Software	O
and	O
maintained	O
by	O
its	O
owner	O
and	O
developer	O
Jon	O
Ashwell	O
.	O
</s>
<s>
Bookends	B-Application
is	O
able	O
to	O
carry	O
out	O
Internet	O
searches	O
in	O
a	O
number	O
of	O
websites	O
such	O
as	O
PubMed	B-Library
and	O
Google	B-Library
Scholar	I-Library
in	O
order	O
to	O
retrieve	O
references	O
and	O
corresponding	O
PDF	B-Application
files	I-Application
or	O
web	O
pages	O
,	O
or	O
to	O
obtain	O
references	O
for	O
articles	O
in	O
PDF	B-Application
format	I-Application
which	O
were	O
already	O
retrieved	O
.	O
</s>
<s>
These	O
search	O
capabilities	O
are	O
also	O
present	O
in	O
Reference	O
Miner	O
,	O
a	O
freeware	O
scaled-down	O
version	O
of	O
Bookends	B-Application
which	O
lacks	O
bibliographic	O
management	O
features	O
.	O
</s>
<s>
There	O
also	O
exists	O
a	O
version	O
of	O
Apple	O
's	O
iOS	O
that	O
can	O
either	O
be	O
used	O
as	O
a	O
stand-alone	O
reference	B-Application
manager	I-Application
or	O
synchronized	O
with	O
the	O
desktop	O
version	O
.	O
</s>
