Gaya APA
Marulafau, S. (2002).
The influence of existential Philosophers to some of American Writers in the 20th Century (Vol. 2, No. 1/ April 2002).
Medan:
Fakultas Sastra Universitas Islam Sumatera Utara.
Gaya MLA
Marulafau, Siamir.
"The influence of existential Philosophers to some of American Writers in the 20th Century".
Vol. 2, No. 1/ April 2002
Medan:
Fakultas Sastra Universitas Islam Sumatera Utara,
2002.
Art Original.