Explanation : Likert scale: Respondents indicate the extent of
their agreement with each item on a scale (e.g.,
a five- or-seven point scale). Their score is the
sum of the scores for each item on the scale.
Guttman scale: The researcher prepares a
set of statements reflecting an increasing
intensity of attitude relating to the concept
under study. Starting at the base, the statement
with which the respondent disagrees reflects
his/her scale position.
A Thurstone scale: It consists of statements
(with a certain ascribed value each) with
which the respondent has to agree or disagree;
and only those with which they agree are
scored. The respondent's score on the scale
corresponds to the median score of the items
with which he/she agrees.
MLA is not a scale but a format of writing
research paper/thesis.