Harahap, A. E. (1953). Djawab soal-soal ilmu memegang buku. [S.l.]: Effendiharahap Bookstore.
Chicago Style CitationHarahap, A. Effendi. Djawab Soal-soal Ilmu Memegang Buku. [S.l.]: Effendiharahap Bookstore, 1953.
MLA CitationHarahap, A. Effendi. Djawab Soal-soal Ilmu Memegang Buku. [S.l.]: Effendiharahap Bookstore, 1953.
Warning: These citations may not always be 100% accurate.