Namely: Estonian has several sets of correct quote mark glyphs for double
quotes („”, „“, «» are all common), however the Institute of Estonian
Language [1] recommends using the first of these, i.e. „” (99 low, 99
high) [2]. As for single quotes, Estonian texts rarely use them, except in
a few fields such as linguistics and biology -- and both ‘’ (9-9) and ’’
(6-9) are considered correct [2, 3]. However, apostrophe in the beginning
of a word (which is effectively the same as a starting single quote) can
also be used to indicate omitted character(s) -- but there, only ’ (9) is
correct [3].

[1] Eesti Keele Instituut, the main official body which maintains and
studies the usage of Estonian language; http://en.eki.ee/index.php
[2] The last page of
https://docs.google.com/viewer?url=http://keeleabi.eki.ee/pdf/164.pdf (in
Estonian)
[3] Handbook of Estonian Language,
http://www.eki.ee/books/ekk09/index.php?p=2&p1=11&id=86 (in Estonian)

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