Citation in text
Please ensure that every reference cited in the text is also present in the reference list (and vice versa). Any references cited in the abstract must be given in full. Unpublished results and personal communications are not recommended in the reference list but may be mentioned in the text. If these references are included in the reference list, they should follow the standard reference style of the journal and should include a substitution of the publication date with either "Unpublished results" or "Personal communication" Citation of a reference as "in press" implies that the item has been accepted for publication.
As a minimum, the full URL should be given and the date when the reference was last accessed. Any further information, if known (DOI, author names, dates, reference to a source publication, etc.), should also be given. Web references can be listed separately (e.g., after the reference list) under a different heading if desired, or can be included in the reference list.
- Text: Indicate references by number(s) in square brackets in line with the text. The actual authors can be referred to, but the reference number(s) must always be given.
Example: "..... as demonstrated [3,6]. Barnaby and Jones  obtained a different result ...."
- List: Number the references (numbers in square brackets) in the list in the order in which they appear in the text.
Reference to a journal publication:
 Utari, U., Kusumandari, K., Purnama, B., Mudasir, M., Abraha, K., 2016, Surface morphology of Fe(III)-porphyrin thin layers as characterized by atomic force microscopy, Indones. J. Chem., 16(3), 233-238.
Reference to a book:
 W. Strunk Jr., E.B. White, 1979, The Elements of Style, third ed., Macmillan, New York.
Reference to a chapter in an edited book:
 G.R. Mettam, L.B. Adams, in: B.S. Jones, R.Z. Smith (Eds.), 1994, Introduction to the Electronic Age, E-Publishing, Inc. New York, pp. 281–304.