APA Баримт

(1989). Science year 1990: The world book annual science supplement: A review of Science and Technology During the 1989 School year. Оникс.

Чикаго маягийн жагсаалт

Science Year 1990: The World Book Annual Science Supplement: A Review of Science and Technology During the 1989 School Year. chicago: Оникс, 1989.

MLA ишлэл

Science Year 1990: The World Book Annual Science Supplement: A Review of Science and Technology During the 1989 School Year. Оникс, 1989.