参考系

cānkǎoxì

frame of reference

参考书

cānkǎoshū

reference book

参考文献

cānkǎowénxiàn

cited material

参考材料

cānkǎocáiliào

reference material

参考消息

CānkǎoXiāoxī

Reference News (PRC limited-distribution daily newspaper)

仅作参考

jǐnzuòcānkǎo

for reference only

参考资料

cānkǎozīliào

reference material

仅供参考

jǐngōngcānkǎo

for reference only