REFERENCES
Achirani. 2011. An Error Analysis Of The Use Of Using Present Tense Made By Students of Second Year Junior High School Of Madrasah Tsanawiyah Al Wasliyah 16 Perbaungan. Medan: University of Sumatera Utara.
Arikunto, Suharsimi. 1993. ProsedurPenelitian: SuatuPendekatanPraktek. Jakarta: RinekaCipta.
Bill Bryson, op cite. 1949. The Story of Language. Philadelphia:
Collin, Harper. 1993. Collins Cobuild English Grammar. London: Harper Collins Publisher.
Curme, George. O. 1873. English Grammar. New York: Barnes and Noble, Inc. Djajasudarma. 1993. MetodologiLinguistik. Bandung: IKIP.
Ellis, Rod.1985. Understanding Second Language Acquisition.Oxford : Oxford University Press.
Fries, Charles Carpenter. 1957. The Structure of English. London: Longman, Green and Co.
Hadi, Hadi. 1996. Dasar-DasarMetodologiPenelitianKuantitatifdalamPendidikan. Jakarta:RajaGrapindo.
Kardimin. 2004. Bahasa. Jakarta: GramediaPustakaUtama.
Lado, Robert. 1961. Language Testing : The Construction and Use of Foreign Language Tests. London : Longman Group Limited.
Lock, Graham. 1996. Functional English Grammar. New York : Cambridge University Press.
MarlinaP.,Dona. 2010. An Analysis of Year IX Primagama Student’s Ability In Mastering Elliptical Construction. Medan: University of Sumatera Utara.
Murdiyatmoko, Janu. 2007. SosiologiMengkajidanMemahamiMasyarakat. Jakarta: Grafindo Media Pratama.
Nurkancana, Wayan and P. P. N. Sumartana. 1986. EvaluasiPendidikan. Surabaya: UsahaNasional.
Sapir, Edward.1921. Language : An Introduction to the study of Speech. Ottawa : Foreign Language Teaching and Research Press.
Sarwono, Jonathan. 2010. PintarMenulisKaranganIlmiahkuncisuksesdalammenulisilmiah. Yogyakarta:
ANDI OFFSET.
Sudjiono. 1991. MetodeStatistika. EdisiKelima. Bandung: Tarsito.
Prambandari. 2008. An Analysis On Primary School Students’ Ability To Use Personal Pronouns: A Case Study On The Sixth Year Students Of SDN NO.
101878 Tg. Morawa.Medan: University of Sumatera Utara.
Yule, George. 1996. Pragmatics. Hongkong: Oxford University Press.
Wikipedia. (online), March 2015).