# Pertemuan 2 Cross-references

## 2.1 Chapters and sub-chapters

There are two steps to cross-reference any heading:

1. Label the heading: # Hello world {#nice-label}.
• Leave the label off if you like the automated heading generated based on your heading title: for example, # Hello world = # Hello world {#hello-world}.
• To label an un-numbered heading, use: # Hello world {-#nice-label} or {# Hello world .unnumbered}.
2. Next, reference the labeled heading anywhere in the text using \@ref(nice-label); for example, please see Chapter 2.

## 2.2 Captioned figures and tables

Figures and tables with captions can also be cross-referenced from elsewhere in your book using \@ref(fig:chunk-label) and \@ref(tag:chunk-label), respectively.

See Figure 2.1.

par(mar = c(4, 4, .1, .1))
plot(pressure, type = 'b', pch = 19)

Don’t miss Table 2.1.

knitr::kable(
head(pressure, 10), caption = 'Here is a nice table!',
booktabs = TRUE
)
Table 2.1: Here is a nice table!
temperature pressure
0 0.0002
20 0.0012
40 0.0060
60 0.0300
80 0.0900
100 0.2700
120 0.7500
140 1.8500
160 4.2000
180 8.8000