Observation on the feeding of Nudibranch Phyllidia varicosa Lamarck, 1801 on the sponge Axinyssa cf. aculeata Wilson, 1925 in coral reefs of Pramuka Island, Thousand Island National Park, Indonesia
Lembaga Penelitian Universitas Indonesia, 2003
 Artikel Jurnal
Yasman, author
Sebaran Vertical Nudibranchia (Mollusca: Gastropoda) di Terumbu Karang-Karang Lebar, Pulau Semak Daun Taman Nasional Laut Kepulauan Seribu dan Catatan Pertama (First Record) Pengamatan Pemangsaan Phyllidia Varicosa Lamarck, 1801 terhadap Sponge Axinyssa Cf. Aculeaia Wilson 1925
Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 2002
 UI - Laporan Penelitian
Issues in participant observation : a text and reader
edited by George J. McCall, J.L. Simmons.
Random House, 1969
 Buku Teks
Podmore, Valerie N. , author
Observation: origins and approaches in early childhood
McGraw-Hill, 2012
 Buku Teks
Caper, Robert, author
Building out into the dark : theory and observation in science and psychoanalysis
Routledge, Taylor & Francis Group, 2009
 Buku Teks
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