Referendum and Plebiscite

I have doubt regarding difference between Referendum and Plebiscite..Laxmikanth says..Referendum is a procedure whereby a proposed legislation is refered to the electorate for settlement by direct votes And Plebiscite is a method of obtaining the opinion of people on any issue of public importance like territorial dispute. Then how come referendum was made in eastern Ukraine and Scotland ..rather plebiscite should be made.pls clarify...Also on net it is written that plebiscite is subset of Referendum .Plebsite empower govt, where as referendum empowers masses and things like that..I am not able to comprehend.”

Referendum- A general vote by the electorate on a single political question which has been referred to them for a direct decision. Origin - mid 19th century: from Latin, gerund ( 'referring') or neuter gerundive 

( 'something to be brought back or referred') of referre (see refer).

plebiscite: The direct vote of all the members of an electorate on an important public question such as a change in the constitution: Origin - mid 16th century (referring to Roman history): from French plébiscite, from Latin plebiscitum, from plebs, pleb- 'the common people' + scitum 'decree' (from sciscere 'vote for'). The sense 'direct vote of the whole electorate' dates from the mid 19th century.

(taken from Oxford international law): A referendum is defined as a direct vote by the electorate of a country to advise or decide on a specific issue, in contrast to votes for individual candidates to national or local elections. The terms referendum and plebiscite are used interchangeably as they both involve a vote by the whole electorate on a specific issue. However, the term referendum is now preferred as generally used by democracies under democratic conditions. Plebiscites, legitimately used at times to decide on territorial or sovereignty issues, or the adoption of a new constitution, have acquired a negative connotation when used by dictatorial regimes under undemocratic conditions to approve or confirm the appointment of a ruler, or a political regime restricting individual freedoms.